// @name      The Fade Anything Technique

// @namespace http://www.axentric.com/aside/fat/

// @version   1.0-RC1

// @author    Adam Michela

var Fat = {

	make_hex : function (r,g,b) 

	{

		r = r.toString(16); if (r.length == 1) r = '0' + r;

		g = g.toString(16); if (g.length == 1) g = '0' + g;

		b = b.toString(16); if (b.length == 1) b = '0' + b;

		return "#" + r + g + b;

	},

	fade_all : function ()

	{

		var a = document.getElementsByTagName("div");

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

		{

			var o = a[i];

			var r = /fade-?(\w{3,6})?/.exec(o.className);

			if (r)

			{

				if (!r[1]) r[1] = "";

        if (!o.id) o.id = 'autofat_'+Math.floor(Math.random() * 100000);

				if (o.id) Fat.fade_element(o.id,null,null,"#"+r[1]);

			}

		}

	},

	fade_element : function (id, fps, duration, from, to) 

	{

		if (!fps) fps = 30;

		if (!duration) duration = 3000;

		if (!from || from=="#") from = "#FFFF33";

		if (!to) to = this.get_bgcolor(id);

		var frames = Math.round(fps * (duration / 1000));

		var interval = duration / frames;

		var delay = interval;

		var frame = 0;

		if (from.length < 7) from += from.substr(1,3);

		if (to.length < 7) to += to.substr(1,3);

		var rf = parseInt(from.substr(1,2),16);

		var gf = parseInt(from.substr(3,2),16);

		var bf = parseInt(from.substr(5,2),16);

		var rt = parseInt(to.substr(1,2),16);

		var gt = parseInt(to.substr(3,2),16);

		var bt = parseInt(to.substr(5,2),16);

		var r,g,b,h;

		while (frame < frames)

		{

			r = Math.floor(rf * ((frames-frame)/frames) + rt * (frame/frames));

			g = Math.floor(gf * ((frames-frame)/frames) + gt * (frame/frames));

			b = Math.floor(bf * ((frames-frame)/frames) + bt * (frame/frames));

			h = this.make_hex(r,g,b);

			setTimeout("Fat.set_bgcolor('"+id+"','"+h+"')", delay);

			frame++;

			delay = interval * frame; 

		}

		setTimeout("Fat.set_bgcolor('"+id+"','"+to+"')", delay);

	},

	set_bgcolor : function (id, c)

	{

		var o = document.getElementById(id);

    if(!o) return;

		o.style.backgroundColor = c;

	},

	get_bgcolor : function (id)

	{

		var o = document.getElementById(id);

		while(o)

		{

			var c;

			if (window.getComputedStyle) c = window.getComputedStyle(o,null).getPropertyValue("background-color");

			if (o.currentStyle) c = o.currentStyle.backgroundColor;

			if ((c != "" && c != "transparent") || o.tagName == "BODY") { break; }

			o = o.parentNode;

		}

		if (c == undefined || c == "" || c == "transparent") c = "#FFFFFF";

		var rgb = c.match(/rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)/);

		if (rgb) c = this.make_hex(parseInt(rgb[1]),parseInt(rgb[2]),parseInt(rgb[3]));

		return c;

	}

}

addOnloadHook(Fat.fade_all);