// @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("*");
		 		 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) Fat.fade_element(o.id,null,null,"#"+r[1]);
		 		 		 }
		 		 }
		 },
		 fade_element : function (id, fps, duration, from, to) 
		 {
		 		 if (!fps) fps = 60;
		 		 if (!duration) duration = 6000;
		 		 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);
		 		 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;
		 }
}

window.onload = function () 
		 {
		 Fat.fade_all();
		 }