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_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;
		  }
		  // modified to remove the "fadeto" color after fade
		 	setTimeout("Fat.set_bgcolor('"+id+"','transparent')", 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;
		}
}