/*
moo.fx, simple effects library built with prototype.js (http://prototype.conio.net).
by Valerio Proietti (http://mad4milk.net) MIT-style LICENSE.
for more info (http://moofx.mad4milk.net).
Saturday, February 11, 2006
v 1.2.1
*/

var fx = new Object();
//base
fx.Base = function(){};
fx.Base.prototype = {
setOptions: function(options) {
this.options = {
	duration: 500,
	onComplete: '',
	transition: fx.sinoidal
}
Object.extend(this.options, options || {});
},

go: function() {
	this.startTime = (new Date).getTime();
	this.timer = setInterval (this.step.bind(this), 13);
},

step: function() {
	var time  = (new Date).getTime();
	if (time >= this.options.duration+this.startTime) {
	this.now = this.to;
	clearInterval (this.timer);
	this.timer = null;
	if (this.options.onComplete) setTimeout(this.options.onComplete.bind(this), 10);
	}
	else {
	var Tpos = (time - this.startTime) / (this.options.duration);
	this.now = this.options.transition(Tpos) * (this.to-this.from) + this.from;
	}
	this.increase();
},

custom: function(from, to) {
	if (this.timer != null) return;
	this.from = from;
	this.to = to;
	this.go();
},

hide: function() {
	this.now = 0;
	this.increase();
},

clearTimer: function() {
	clearInterval(this.timer);
	this.timer = null;
}
}

//stretchers
fx.Layout = Class.create();
fx.Layout.prototype = Object.extend(new fx.Base(), {
initialize: function(el, options) {
	this.el = $(el);
	this.el.style.overflow = "hidden";
	this.el.iniWidth = this.el.offsetWidth;
	this.el.iniHeight = this.el.offsetHeight;
	this.setOptions(options);
}
});

fx.Height = Class.create();
Object.extend(Object.extend(fx.Height.prototype, fx.Layout.prototype), {
increase: function() {
        var newValue = this.now + "px";
        this.el.style.height = newValue;
        testString += this.el.style.height + "\n";
        testObj = this.el;
    },

toggle: function() {
	if (this.el.offsetHeight > 0) this.custom(this.el.offsetHeight, 0);
	else this.custom(0, this.el.scrollHeight);
}
});

fx.Width = Class.create();
Object.extend(Object.extend(fx.Width.prototype, fx.Layout.prototype), {
increase: function() {
	this.el.style.width = this.now + "px";
},

toggle: function(){
	if (this.el.offsetWidth > 0) this.custom(this.el.offsetWidth, 0);
	else this.custom(0, this.el.iniWidth);
}
});

//fader
fx.Opacity = Class.create();
fx.Opacity.prototype = Object.extend(new fx.Base(), {
initialize: function(el, options) {
	this.el = $(el);
	this.now = 1;
	this.increase();
	this.setOptions(options);
},

increase: function() {
	if (this.now == 1 && (/Firefox/.test(navigator.userAgent))) this.now = 0.9999;
	this.setOpacity(this.now);
},

setOpacity: function(opacity) {
        /*
        if (window.ActiveXObject) this.el.style.filter = "alpha(opacity=" + opacity*100 + ")";
	this.el.style.opacity = opacity;
	if (opacity == 0) this.el.style.visibility = "hidden";
	else this.el.style.visibility = "visible";
	*/
},

toggle: function() {
	if (this.now > 0) this.custom(1, 0);
	else this.custom(0, 1);
}
});

//transitions
fx.sinoidal = function(pos){
return ((-Math.cos(pos*Math.PI)/2) + 0.5);
//this transition is from script.aculo.us
}
fx.linear = function(pos){
return pos;
}
fx.cubic = function(pos){
return Math.pow(pos, 3);
}
fx.circ = function(pos){
return Math.sqrt(pos);
}