98 // Tell which elements have the specified CSS class

    99 // Parameters:

   100 //   * object - HTMLElement

   101 //   * string - class name

   102 //   * string - tag name, if omitted will test all elements (slow)

   103 function getElementsByClassName(oRoot, className, tagName)

   104 {

   105   tagName = ( tagName ) ? tagName : '*';

   106   var arrEls = document.getElementsByTagName(tagName);

   107   var arrResult = [];

   108   for ( var i = 0; i < arrEls.length; i++ )

   109   {

   110     if ( $(arrEls[i]).hasClass(className) )

   111     {

   112       arrResult.push(arrEls[i]);

   113     }

   114   }

   115   return arrResult;

   116 }

   117 

   118 // shortcut :)

   119 document.getElementsByClassName = function(a, b)

   120 {

   121   return getElementsByClassName(document, a, b);

   122 }

   123