// @name      The Fade Anything Technique
// @namespace http://www.axentric.com/aside/fat/
// @version   1.0-RC1
// @author    Adam Michela

// Edited by Computer Diagnostic Services
// 11th January 2007

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 = 30;
        }
        if (!duration){
            duration = 2000;
        }
        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();
}