var Modalizer = new Class({
	defaultModalStyle: {
		display:'block',
		position:'fixed',
		top:'0px',
		left:'0px',	
		'z-index':5000,
		'background-color':'#333',
		opacity:0.8
	},
/*	Property: setOptions
		Sets the options for the modal overlay.
		
		Arguments:
		options - an object with name/value definitions
		
		See <modalShow> for options list.
	*/
	setModalOptions: function(options){
		this.modalOptions = $merge({
			width:(window.getScrollWidth()+300)+'px',
			height:(window.getScrollHeight()+300)+'px',
			elementsToHide: 'select',
			onModalHide: Class.empty,
			onModalShow: Class.empty,
			hideOnClick: true,
			modalStyle: {},
			updateOnResize: true
		}, this.modalOptions, options || {});
	},
	resize: function(){
		if($('modalOverlay')) {
			$('modalOverlay').setStyles({
				width:(window.getScrollWidth()+300)+'px',
				height:(window.getScrollHeight()+300)+'px'
			});
		}
	},

	setModalStyle: function (styleObject){
		this.modalOptions.modalStyle = styleObject;
		this.modalStyle = $merge(this.defaultModalStyle, {
			width:this.modalOptions.width,
			height:this.modalOptions.height
		}, styleObject);
		if($('modalOverlay'))$('modalOverlay').setStyles(this.modalStyle);
		return(this.modalStyle);
	},

	modalShow: function(options){
		this.setModalOptions(options||{});
		var overlay = null;
		if($('modalOverlay')) overlay = $('modalOverlay');
		if(!overlay) overlay = new Element('div').setProperty('id','modalOverlay').injectInside(document.body);
		overlay.setStyles(this.setModalStyle(this.modalOptions.modalStyle));
		if(window.ie6) overlay.setStyle('position','absolute');
		$('modalOverlay').removeEvents('click').addEvent('click', function(){
			this.modalHide(this.modalOptions.hideOnClick);
		}.bind(this));
		this.bound = this.bound||{};
		if(!this.bound.resize && this.modalOptions.updateOnResize) {
			this.bound.resize = this.resize.bind(this);
			window.addEvent('resize', this.bound.resize);
		}
		this.modalOptions.onModalShow();
		this.togglePopThroughElements(0);
		overlay.setStyle('display','block');
		return this;
	},

	modalHide: function(override){
		if(override === false) return false; //this is internal, you don't need to pass in an argument
		this.togglePopThroughElements(1);
		this.modalOptions.onModalHide();
		if($('modalOverlay'))$('modalOverlay').setStyle('display','none');
		if(this.modalOptions.updateOnResize) {
			this.bound = this.bound||{};
			if(!this.bound.resize) this.bound.resize = this.resize.bind(this);
			window.removeEvent('resize', this.bound.resize);
		}

		return this;
	},
	togglePopThroughElements: function(opacity){
		if((window.ie6 || (window.gecko && navigator.userAgent.test('mac', 'i')))) {
			$$(this.modalOptions.elementsToHide).each(function(sel){
				sel.setStyle('opacity', opacity);
			});
		}
	}
});
//legacy namespace
var modalizer = Modalizer;