/*
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).
Sunday, March 05, 2006
v 1.2.3
*/

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

if (checkIt('konqueror'))
{
	browser = "Konqueror";
	OS = "Linux";
}
else if (checkIt('safari')) browser = "Safari"
else if (checkIt('omniweb')) browser = "OmniWeb"
else if (checkIt('opera')) browser = "Opera"
else if (checkIt('webtv')) browser = "WebTV";
else if (checkIt('icab')) browser = "iCab"
else if (checkIt('msie')) browser = "Internet Explorer"
else if (!checkIt('compatible'))
{
	browser = "Netscape Navigator"
	version = detect.charAt(8);
}
else browser = "An unknown browser";

function checkIt(string)
{
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}

var isIE = (browser == "Internet Explorer");
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 || {});
	},

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

	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.iniWidth = this.el.offsetWidth;
		this.iniHeight = this.el.offsetHeight;
		this.setOptions(options);
	}
});

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

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

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.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(isIE)
		{
			if (opacity == 0 && this.el.style.display != "none")
			{
				this.el.style.display = "none";
			}
			else if (this.el.style.display != "inline") 
			{
				this.el.style.display = "inline";
			}	

			if(opacity != 1)
			{
				opacity = (opacity*100);
				opacity = Math.round(opacity);
				this.el.style.filter = "progid:DXImageTransform.Microsoft.Alpha(opacity=" + (opacity) + ")";
			}
			else
				this.el.style.filter = null;
			
		}
		else
		{
			if (opacity == 0 && this.el.style.visibility != "hidden")
				this.el.style.visibility = "hidden";
			else if (this.el.style.visibility != "visible") 
				this.el.style.visibility = "visible";
				
			this.el.style.MozOpacity = opacity;
		}
	},


	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);
}