// Some additional DHTML functions

function fetch_offset(obj) {
  var left_offset = obj.offsetLeft;
  var top_offset = obj.offsetTop;
  while ((obj = obj.offsetParent) != null) {
    left_offset += obj.offsetLeft;
    top_offset += obj.offsetTop;
  }
  return { 'left' : left_offset, 'top' : top_offset };
}

function fetch_dimensions(o) {
  var w = o.offsetWidth;
  var h = o.offsetHeight;
  return { 'w' : w, 'h' : h };
}

function findParentForm(o)
{
  if ( o.tagName == 'FORM' )
    return o;
  while(true)
  {
    o = o.parentNode;
    if ( !o )
      return false;
    if ( o.tagName == 'FORM' )
      return o;
  }
  return false;
}

function ajaxReverseDNS(o, text)
{
  if(text) var ipaddr = text;
  else var ipaddr = o.innerHTML;
  rDnsObj = o;
  rDnsBannerObj = bannerOn('Retrieving reverse DNS info...');
  ajaxGet(stdAjaxPrefix+'&_mode=rdns&ip='+ipaddr, function() {
      if(ajax.readyState == 4)
      {
        off = fetch_offset(rDnsObj);
        dim = fetch_dimensions(rDnsObj);
        right = off['left'] + dim['w'];
        top = off['top'] + dim['h'];
        var thediv = document.createElement('div');
        thediv.className = 'info-box';
        thediv.style.margin = '0';
        thediv.style.position = 'absolute';
        thediv.style.top  = top  + 'px';
        thediv.style.display = 'none';
        thediv.style.zIndex = getHighestZ() + 2;
        thediv.id = 'mdgDynamic_rDnsInfoDiv_'+Math.floor(Math.random() * 1000000);
        thediv.innerHTML = '<b>Reverse DNS:</b><br />'+ajax.responseText+' <a href="#" onclick="elem = document.getElementById(\''+thediv.id+'\'); elem.innerHTML = \'\'; elem.style.display = \'none\';return false;">Close</a>';
        var body = document.getElementsByTagName('body');
        body = body[0];
        bannerOff(rDnsBannerObj);
        body.appendChild(thediv);
        thediv.style.display = 'block';
        left = fetch_dimensions(thediv);
        thediv.style.display = 'none';
        left = right - left['w'];
        thediv.style.left = left + 'px';
        thediv.style.display = 'block';
        fadeInfoBoxes();
      }
    });
}

function bannerOn(text)
{
  darken(true);
  var thediv = document.createElement('div');
  thediv.className = 'mdg-comment';
  thediv.style.padding = '0';
  thediv.style.marginLeft = '0';
  thediv.style.position = 'absolute';
  thediv.style.display = 'none';
  thediv.style.padding = '4px';
  thediv.style.fontSize = '14pt';
  thediv.id = 'mdgDynamic_bannerDiv_'+Math.floor(Math.random() * 1000000);
  thediv.innerHTML = text;
  
  var body = document.getElementsByTagName('body');
  body = body[0];
  body.appendChild(thediv);
  body.style.cursor = 'wait';
  
  thediv.style.display = 'block';
  dim = fetch_dimensions(thediv);
  thediv.style.display = 'none';
  bdim = { 'w' : getWidth(), 'h' : getHeight() };
  so = getScrollOffset();
  
  var left = (bdim['w'] / 2) - ( dim['w'] / 2 );
  
  var top  = (bdim['h'] / 2);
  top  = top - ( dim['h'] / 2 );
  
  top = top + so;
  
  thediv.style.top  = top  + 'px';
  thediv.style.left = left + 'px';
  
  thediv.style.display = 'block';
  
  return thediv.id;
}

function bannerOff(id)
{
  e = document.getElementById(id);
  if(!e) return;
  e.innerHTML = '';
  e.style.display = 'none';
  var body = document.getElementsByTagName('body');
  body = body[0];
  body.style.cursor = 'default';
  enlighten(true);
}

function disableUnload(message)
{
  if(typeof message != 'string') message = 'You may want to save your changes first.';
  var body = document.getElementsByTagName('body');
  body = body[0];
  body.onbeforeunload='return unescape(\''+escape(message)+'\')';
}

function enableUnload()
{
  var body = document.getElementsByTagName('body');
  body = body[0];
  body.onbeforeunload = null;
}

/**
 * Gets the highest z-index of all divs in the document
 * @return integer
 */
function getHighestZ()
{
  z = 0;
  var divs = document.getElementsByTagName('div');
  for(var i = 0; i < divs.length; i++)
  {
    if(divs[i].style.zIndex > z) z = divs[i].style.zIndex;
  }
  return z;
}

function isKeyPressed(event)
{
  if (event.shiftKey==1)
  {
    shift = true;
  }
  else
  {
    shift = false;
  }
}

function moveDiv(div, newparent)
{
  var backup = div;
  var oldparent = div.parentNode;
  oldparent.removeChild(div);
  newparent.appendChild(backup);
}

function readCookie(name) {var nameEQ = name + "=";var ca = document.cookie.split(';');for(var i=0;i < ca.length;i++){var c = ca[i];while (c.charAt(0)==' ') c = c.substring(1,c.length);if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);}return null;}
function createCookie(name,value,days){if (days){var date = new Date();date.setTime(date.getTime()+(days*24*60*60*1000));var expires = "; expires="+date.toGMTString();}else var expires = "";document.cookie = name+"="+value+expires+"; path=/";}
function eraseCookie(name) {createCookie(name,"",-1);}

var busyBannerID;
function goBusy(msg)
{
  if(!msg) msg = 'Please wait...';
  body = document.getElementsByTagName('body');
  body = body[0];
  body.style.cursor = 'wait';
  busyBannerID = bannerOn(msg);
}

function unBusy()
{
  body = document.getElementsByTagName('body');
  body = body[0];
  body.style.cursor = 'default';
  bannerOff(busyBannerID);
}

function setAjaxLoading()
{
  if ( document.getElementById('ajaxloadicon') )
  {
    document.getElementById('ajaxloadicon').src=ajax_load_icon;
  }
}

function unsetAjaxLoading()
{
  if ( document.getElementById('ajaxloadicon') )
  {
    document.getElementById('ajaxloadicon').src=scriptPath + '/images/spacer.gif';
  }
}

/*
 * Search boxes
 */
 
function buildSearchBoxes()
{
  var divs = document.getElementsByTagName('*');
  var boxes = new Array();
  for ( var i = 0; i < divs.length; i++ )
  {
    if ( divs[i].className)
    {
      if ( divs[i].className.substr(0, 9) == 'searchbox' )
      {
        boxes.push(divs[i]);
      }
    }
  }
  for ( var i = 0; i < boxes.length; i++ )
  {
    if ( boxes[i].className.match(/^searchbox\[([0-9]+)px\]$/) )
    {
      var width = boxes[i].className.match(/^searchbox\[([0-9]+)px\]$/);
      width = parseInt(width[1]);
    }
    else
    {
      var width = 120;
    }
    createSearchBox(boxes[i], width);
  }
}

function createSearchBox(parent, width)
{
  if ( typeof(parent) != 'object')
  {
    alert('BUG: createSearchBox(): parent is not an object');
    return false;
  }
  //parent.style.padding = '0px';
  //parent.style.textAlign = 'center';
  parent.style.width = width + 'px';
  var submit = document.createElement('div');
  submit.onclick = function() { searchFormSubmit(this); };
  submit.className = 'js-search-submit';
  var input = document.createElement('input');
  input.className = 'js-search-box';
  input.value = 'Search';
  input.name = 'q';
  input.style.width = ( width - 28 ) + 'px';
  input.onfocus = function() { if ( this.value == 'Search' ) this.value = ''; };
  input.onblur  = function() { if ( this.value == '' ) this.value = 'Search'; };
  parent.appendChild(input);
  var off = fetch_offset(input);
  var top = off['top'] + 'px';
  var left = ( parseInt(off['left']) + ( width - 24 ) ) + 'px';
  submit.style.top = top;
  submit.style.left = left;
  parent.appendChild(submit);
}

function searchFormSubmit(obj)
{
  var input = obj.previousSibling;
  if ( input.value == 'Search' || input.value == '' )
    return false;
  var p = obj;
  while(true)
  {
    p = p.parentNode;
    if ( !p )
      break;
    if ( typeof(p.tagName) != 'string' )
      break;
    else if ( p.tagName.toLowerCase() == 'form' )
    {
      p.submit();
    }
    else if ( p.tagName.toLowerCase() == 'body' )
    {
      break;
    }
  }
}

/*
 * AJAX login box (experimental)
 */

var ajax_auth_prompt_cache = false;
var ajax_auth_mb_cache = false;
var ajax_auth_level_cache = false;
var ajax_auth_error_string = false;
var ajax_auth_show_captcha = false;

function ajaxAuthErrorToString($data)
{
  var $errstring = $data.error;
  // this was literally copied straight from the PHP code.
  switch($data.error)
  {
    case 'key_not_found':
      $errstring = 'Enano couldn\'t look up the encryption key used to encrypt your password. This most often happens if a cache rotation occurred during your login attempt, or if you refreshed the login page.';
      break;
    case 'key_wrong_length':
      $errstring = 'The encryption key was the wrong length.';
      break;
    case 'too_big_for_britches':
      $errstring = 'You are trying to authenticate at a level that your user account does not permit.';
      break;
    case 'invalid_credentials':
      $errstring = 'You have entered an invalid username or password. Please enter your login details again.';
      if ( $data.lockout_policy == 'lockout' )
      {
        $errstring += ' You have used up '+$data['lockout_fails']+' out of '+$data['lockout_threshold']+' login attempts. After you have used up all '+$data['lockout_threshold']+' login attempts, you will be locked out from logging in for '+$data['lockout_duration']+' minutes.';
      }
      else if ( $data.lockout_policy == 'captcha' )
      {
        $errstring += ' You have used up '+$data['lockout_fails']+' out of '+$data['lockout_threshold']+' login attempts. After you have used up all '+$data['lockout_threshold']+' login attempts, you will have to enter a visual confirmation code before logging in, effective for '+$data['lockout_duration']+' minutes.';
      }
      break;
    case 'backend_fail':
      $errstring = 'You entered the right credentials and everything was validated, but for some reason Enano couldn\'t register your session. This is an internal problem with the site and you are encouraged to contact site administration.';
      break;
    case 'locked_out':
      $attempts = parseInt($data['lockout_fails']);
      if ( $attempts > $data['lockout_threshold'])
        $attempts = $data['lockout_threshold'];
      $time_rem = $data.time_rem;
      $s = ( $time_rem == 1 ) ? '' : 's';
      $errstring = "You have used up all "+$data['lockout_threshold']+" allowed login attempts. Please wait "+$time_rem+" minute"+$s+" before attempting to log in again";
      if ( $data['lockout_policy'] == 'captcha' )
        $errstring += ', or enter the visual confirmation code shown above in the appropriate box';
      $errstring += '.';
      break;
  }
  return $errstring;
}

function ajaxPromptAdminAuth(call_on_ok, level)
{
  if ( typeof(call_on_ok) == 'function' )
  {
    ajax_auth_prompt_cache = call_on_ok;
  }
  if ( !level )
    level = USER_LEVEL_MEMBER;
  ajax_auth_level_cache = level;
  var loading_win = '<div align="center" style="text-align: center;"> \
      <p>Fetching an encryption key...</p> \
      <p><small>Not working? Use the <a href="'+makeUrlNS('Special', 'Login/' + title)+'">alternate login form</a>.</p> \
      <p><img alt="Please wait..." src="'+scriptPath+'/images/loading-big.gif" /></p> \
    </div>';
  var title = ( level > USER_LEVEL_MEMBER ) ? 'You are requesting a sensitive operation.' : 'Please enter your username and password to continue.';
  ajax_auth_mb_cache = new messagebox(MB_OKCANCEL|MB_ICONLOCK, title, loading_win);
  ajax_auth_mb_cache.onbeforeclick['OK'] = ajaxValidateLogin;
  ajax_auth_mb_cache.onbeforeclick['Cancel'] = function()
  {
    if ( document.getElementById('autoCaptcha') )
    {
      var to = fly_out_top(document.getElementById('autoCaptcha'), false, true);
      setTimeout(function() {
          var d = document.getElementById('autoCaptcha');
          d.parentNode.removeChild(d);
        }, to);
    }
  }
  ajaxAuthLoginInnerSetup();
}

function ajaxAuthLoginInnerSetup()
{
  ajaxGet(makeUrlNS('Special', 'Login', 'act=getkey'), function() {
      if ( ajax.readyState == 4 )
      {
        var response = String(ajax.responseText);
        if ( response.substr(0,1) != '{' )
        {
          alert('Invalid JSON response from server: ' + response);
          return false;
        }
        response = parseJSON(response);
        var disable_controls = false;
        if ( response.locked_out && !ajax_auth_error_string )
        {
          response.error = 'locked_out';
          ajax_auth_error_string = ajaxAuthErrorToString(response);
          if ( response.lockout_policy == 'captcha' )
          {
            ajax_auth_show_captcha = response.captcha;
          }
          else
          {
            disable_controls = true;
          }
        }
        var level = ajax_auth_level_cache;
        var form_html = '';
        var shown_error = false;
        if ( ajax_auth_error_string )
        {
          shown_error = true;
          form_html += '<div class="error-box-mini" id="ajax_auth_error">' + ajax_auth_error_string + '</div>';
          ajax_auth_error_string = false;
        }
        else if ( level > USER_LEVEL_MEMBER )
        {
          form_html += 'Please re-enter your login details, to verify your identity.<br /><br />';
        }
        if ( ajax_auth_show_captcha )
         {
           var captcha_html = ' \
             <tr> \
               <td>Code in image:</td> \
               <td><input type="hidden" id="ajaxlogin_captcha_hash" value="' + ajax_auth_show_captcha + '" /><input type="text" tabindex="3" size="25" id="ajaxlogin_captcha_code" /> \
             </tr>';
         }
         else
         {
           var captcha_html = '';
         }
         var disableme = ( disable_controls ) ? 'disabled="disabled" ' : '';
        form_html += ' \
          <table border="0" align="center"> \
            <tr> \
              <td>Username:</td><td><input tabindex="1" id="ajaxlogin_user" type="text"     ' + disableme + 'size="25" /> \
            </tr> \
            <tr> \
              <td>Password:</td><td><input tabindex="2" id="ajaxlogin_pass" type="password" ' + disableme + 'size="25" /> \
            </tr> \
            ' + captcha_html + ' \
            <tr> \
              <td colspan="2" style="text-align: center;"> \
                <br /><small>Trouble logging in? Try the <a href="'+makeUrlNS('Special', 'Login/' + title, 'level=' + level)+'">full login form</a>.<br />';
       if ( level <= USER_LEVEL_MEMBER )
       {
         form_html += ' \
                Did you <a href="'+makeUrlNS('Special', 'PasswordReset')+'">forget your password</a>?<br /> \
                Maybe you need to <a href="'+makeUrlNS('Special', 'Register')+'">create an account</a>.</small>';
       }
       form_html += ' \
              </td> \
            </tr> \
          </table> \
          <input type="hidden" id="ajaxlogin_crypt_key"       value="' + response.key + '" /> \
          <input type="hidden" id="ajaxlogin_crypt_challenge" value="' + response.challenge + '" /> \
        </form>';
        ajax_auth_mb_cache.updateContent(form_html);
        $('messageBox').object.nextSibling.firstChild.tabindex = '3';
        if ( typeof(response.username) == 'string' )
        {
          $('ajaxlogin_user').object.value = response.username;
          $('ajaxlogin_pass').object.focus();
        }
        else
        {
          $('ajaxlogin_user').object.focus();
        }
        if ( ajax_auth_show_captcha )
        {
          $('ajaxlogin_captcha_code').object.onblur = function(e) { if ( !shift ) $('messageBox').object.nextSibling.firstChild.focus(); };
          $('ajaxlogin_captcha_code').object.onkeypress = function(e) { if ( !e && IE ) return true; if ( e.keyCode == 13 ) $('messageBox').object.nextSibling.firstChild.click(); };
        }
        else
        {
          $('ajaxlogin_pass').object.onblur = function(e) { if ( !shift ) $('messageBox').object.nextSibling.firstChild.focus(); };
          $('ajaxlogin_pass').object.onkeypress = function(e) { if ( !e && IE ) return true; if ( e.keyCode == 13 ) $('messageBox').object.nextSibling.firstChild.click(); };
        }
        if ( disable_controls )
        {
          var panel = document.getElementById('messageBoxButtons');
          panel.firstChild.disabled = true;
        }
        /*
        ## This causes the background image to disappear under Fx 2
        if ( shown_error )
        {
          // fade to #FFF4F4
          var fader = new Spry.Effect.Highlight('ajax_auth_error', {duration: 1000, from: '#FFF4F4', to: '#805600', restoreColor: '#805600', finish: function()
              {
                var fader = new Spry.Effect.Highlight('ajax_auth_error', {duration: 3000, from: '#805600', to: '#FFF4F4', restoreColor: '#FFF4F4'});
                fader.start();
          }});
          fader.start();
        }
        */
        if ( ajax_auth_show_captcha )
        {
          ajaxShowCaptcha(ajax_auth_show_captcha);
          ajax_auth_show_captcha = false;
        }
      }
    });
}

function ajaxValidateLogin()
{
  var username,password,auth_enabled,crypt_key,crypt_data,challenge_salt,challenge_data;
  username = document.getElementById('ajaxlogin_user');
  if ( !username )
    return false;
  username = document.getElementById('ajaxlogin_user').value;
  password = document.getElementById('ajaxlogin_pass').value;
  auth_enabled = false;
  
  if ( document.getElementById('autoCaptcha') )
  {
    var to = fly_out_top(document.getElementById('autoCaptcha'), false, true);
    setTimeout(function() {
        var d = document.getElementById('autoCaptcha');
        d.parentNode.removeChild(d);
      }, to);
  }
  
  disableJSONExts();
  
  //
  // Encryption test
  //
  
  var str = '';
  for(i=0;i<keySizeInBits/4;i++)
  {
    str+='0';
  }
  str = hexToByteArray(str);
  var ct  = rijndaelEncrypt(str, str, 'ECB');
  ct      = byteArrayToHex(ct);
  var v;
  switch(keySizeInBits)
  {
    case 128:
      v = '66e94bd4ef8a2c3b884cfa59ca342b2e';
      break;
    case 192:
      v = 'aae06992acbf52a3e8f4a96ec9300bd7aae06992acbf52a3e8f4a96ec9300bd7';
      break;
    case 256:
      v = 'dc95c078a2408989ad48a21492842087dc95c078a2408989ad48a21492842087';
      break;
  }
  auth_enabled = ( ct == v && md5_vm_test() );
  if ( !auth_enabled )
  {
    alert('Login error: encryption sanity check failed\n');
    return true;
  }
  
  crypt_key = document.getElementById('ajaxlogin_crypt_key').value;
  challenge_salt = document.getElementById('ajaxlogin_crypt_challenge').value;
  
  var crypt_key_md5 = hex_md5(crypt_key);
  
  challenge_data = hex_md5(password + challenge_salt) + challenge_salt;
  
  password = stringToByteArray(password);
  crypt_key = hexToByteArray(crypt_key);
  
  crypt_data = rijndaelEncrypt(password, crypt_key, 'ECB');
  crypt_data = byteArrayToHex(crypt_data);
  
  var json_data = {
    'username' : username,
    'crypt_key' : crypt_key_md5,
    'challenge' : challenge_data,
    'crypt_data' : crypt_data,
    'level' : ajax_auth_level_cache
  };
  
  if ( document.getElementById('ajaxlogin_captcha_hash') )
  {
    json_data.captcha_hash = document.getElementById('ajaxlogin_captcha_hash').value;
    json_data.captcha_code = document.getElementById('ajaxlogin_captcha_code').value;
  }
  
  json_data = toJSONString(json_data);
  json_data = encodeURIComponent(json_data);
  
  var loading_win = '<div align="center" style="text-align: center;"> \
      <p>Logging in...</p> \
      <p><img alt="Please wait..." src="'+scriptPath+'/images/loading-big.gif" /></p> \
    </div>';
    
  ajax_auth_mb_cache.updateContent(loading_win);
  
  ajaxPost(makeUrlNS('Special', 'Login', 'act=ajaxlogin'), 'params=' + json_data, function() {
      if ( ajax.readyState == 4 )
      {
        var response = ajax.responseText;
        if ( response.substr(0,1) != '{' )
        {
          alert('Invalid JSON response from server: ' + response);
          ajaxAuthLoginInnerSetup();
          return false;
        }
        response = parseJSON(response);
        switch(response.result)
        {
          case 'success':
            if ( typeof(ajax_auth_prompt_cache) == 'function' )
            {
              ajax_auth_prompt_cache(response.key);
            }
            break;
          case 'success_reset':
            var conf = confirm('You have logged in using a temporary password. Before you can log in, you must finish resetting your password. Do you want to reset your real password now?');
            if ( conf )
            {
              var url = makeUrlNS('Special', 'PasswordReset/stage2/' + response.user_id + '/' + response.temppass);
              window.location = url;
            }
            else
            {
              ajaxAuthLoginInnerSetup();
            }
            break;
          case 'error':
            if ( response.data.error == 'invalid_credentials' || response.data.error == 'locked_out' )
            {
              ajax_auth_error_string = ajaxAuthErrorToString(response.data);
              mb_current_obj.updateContent('');
              document.getElementById('messageBox').style.backgroundColor = '#C0C0C0';
              var mb_parent = document.getElementById('messageBox').parentNode;
              new Spry.Effect.Shake(mb_parent, {duration: 1500}).start();
              setTimeout("document.getElementById('messageBox').style.backgroundColor = '#FFF'; ajaxAuthLoginInnerSetup();", 2500);
              
              if ( response.data.lockout_policy == 'captcha' && response.data.error == 'locked_out' )
              {
                ajax_auth_show_captcha = response.captcha;
              }
            }
            else
            {
              ajax_auth_error_string = ajaxAuthErrorToString(response.data);
              ajaxAuthLoginInnerSetup();
            }
            break;
          default:
            alert(ajax.responseText);
            break;
        }
      }
    });
  
  return true;
  
}

// This code is in the public domain. Feel free to link back to http://jan.moesen.nu/
function sprintf()
{
  if (!arguments || arguments.length < 1 || !RegExp)
  {
    return;
  }
  var str = arguments[0];
  var re = /([^%]*)%('.|0|\x20)?(-)?(\d+)?(\.\d+)?(%|b|c|d|u|f|o|s|x|X)(.*)/;
  var a = b = [], numSubstitutions = 0, numMatches = 0;
  while (a = re.exec(str))
  {
    var leftpart = a[1], pPad = a[2], pJustify = a[3], pMinLength = a[4];
    var pPrecision = a[5], pType = a[6], rightPart = a[7];
    
    //alert(a + '\n' + [a[0], leftpart, pPad, pJustify, pMinLength, pPrecision);

    numMatches++;
    if (pType == '%')
    {
      subst = '%';
    }
    else
    {
      numSubstitutions++;
      if (numSubstitutions >= arguments.length)
      {
        alert('Error! Not enough function arguments (' + (arguments.length - 1) + ', excluding the string)\nfor the number of substitution parameters in string (' + numSubstitutions + ' so far).');
      }
      var param = arguments[numSubstitutions];
      var pad = '';
             if (pPad && pPad.substr(0,1) == "'") pad = leftpart.substr(1,1);
        else if (pPad) pad = pPad;
      var justifyRight = true;
             if (pJustify && pJustify === "-") justifyRight = false;
      var minLength = -1;
             if (pMinLength) minLength = parseInt(pMinLength);
      var precision = -1;
             if (pPrecision && pType == 'f') precision = parseInt(pPrecision.substring(1));
      var subst = param;
             if (pType == 'b') subst = parseInt(param).toString(2);
        else if (pType == 'c') subst = String.fromCharCode(parseInt(param));
        else if (pType == 'd') subst = parseInt(param) ? parseInt(param) : 0;
        else if (pType == 'u') subst = Math.abs(param);
        else if (pType == 'f') subst = (precision > -1) ? Math.round(parseFloat(param) * Math.pow(10, precision)) / Math.pow(10, precision): parseFloat(param);
        else if (pType == 'o') subst = parseInt(param).toString(8);
        else if (pType == 's') subst = param;
        else if (pType == 'x') subst = ('' + parseInt(param).toString(16)).toLowerCase();
        else if (pType == 'X') subst = ('' + parseInt(param).toString(16)).toUpperCase();
    }
    str = leftpart + subst + rightPart;
  }
  return str;
}

/**
 * Insert a DOM object _after_ the specified child.
 * @param object Parent node
 * @param object Node to insert
 * @param object Node to insert after
 */

function insertAfter(parent, baby, bigsister)
{
  try
  {
    if ( parent.childNodes[parent.childNodes.length-1] == bigsister )
      parent.appendChild(baby);
    else
      parent.insertBefore(baby, bigsister.nextSibling);
  }
  catch(e)
  {
    alert(e.toString());
    if ( window.console )
    {
      // Firebug support
      window.console.warn(e);
    }
  }
}

/**
 * Validates an e-mail address.
 * @param string E-mail address
 * @return bool
 */

function validateEmail(email)
{
  return ( email.match(/^(?:[\w\d]+\.?)+@((?:(?:[\w\d]\-?)+\.)+\w{2,4}|localhost)$/) ) ? true : false;
}