var Class = {
	create: function() {
		return function() { 
			this.initialize.apply(this, arguments);
		}
	}
}


Object.extend = function(destination, source) {
	for (property in source) {
		destination[property] = source[property];
	}
	return destination;
}


Function.prototype.bind = function(object) {
	var __method = this;
	return function() {
		return __method.apply(object, arguments);
	}
}


function $() {
	var elements = new Array();

	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);

		if (arguments.length == 1) 
			return element;

		elements.push(element);
	}

	return elements;
}

//-------------------------
document.getElementsByClassName = function(className) {
	var children = document.getElementsByTagName('*') || document.all;
	var elements = new Array();
	
	for (var i = 0; i < children.length; i++) {
		var child = children[i];
		var classNames = child.className.split(' ');
		for (var j = 0; j < classNames.length; j++) {
			if (classNames[j] == className) {
				elements.push(child);
				break;
			}
		}
	}
	
	return elements;
}

//-------------------------

if (!window.Element) {
	var Element = new Object();
}


Object.extend(Element, {
	remove: function(element) {
		element = $(element);
		element.parentNode.removeChild(element);
	},

	hasClassName: function(element, className) {
		element = $(element);
		if (!element)
			return;
		var a = element.className.split(' ');
		for (var i = 0; i < a.length; i++) {
			if (a[i] == className)
				return true;
		}
		return false;
	},

	addClassName: function(element, className) {
		element = $(element);
		Element.removeClassName(element, className);
		element.className += ' ' + className;
	},
	
	removeClassName: function(element, className) {
		element = $(element);
		if (!element)
			return;
		var newClassName = '';
		var a = element.className.split(' ');
		for (var i = 0; i < a.length; i++) {
			if (a[i] != className) {
				if (i > 0)
					newClassName += ' ';
				newClassName += a[i];
			}
		}
		element.className = newClassName;
	},
	
	// removes whitespace-only text node children
	cleanWhitespace: function(element) {
		element = $(element);
		for (var i = 0; i < element.childNodes.length; i++) {
			var node = element.childNodes[i];
			if (node.nodeType == 3 && !/\S/.test(node.nodeValue)) 
				Element.remove(node);
		}
	}
});


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


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


	step: function() {
		var time  = (new Date).getTime();
		var Tpos   = (time - this.startTime) / (this.duration);
		if (time >= this.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 {
			this.now = ((-Math.cos(Tpos*Math.PI)/2) + 0.5) * (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;
	}
}



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) this.now = 0.9999;
		if (this.now > 0 && this.el.style.visibility == "hidden") this.el.style.visibility = "visible";
		if (this.now == 0) this.el.style.visibility = "hidden";
		if (window.ActiveXObject) this.el.style.filter = "alpha(opacity=" + this.now*100 + ")";
		this.el.style.opacity = this.now;
	},


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