var popup = {

	overlayBgColor : '#000',
	overlayOpacity : 0.7,
	overlayName : 'Overlay',
	popupBoxName : 'PopupBox',
	popupName : 'Popup',

	init : function() {
		$(window).resize(function()
		{
			// Get page sizes
			var arrPageSizes = popup._getPageSize();
			// Style overlay and show it
			$('#'+popup.overlayName).css({
				width:		arrPageSizes[0],
				height:		arrPageSizes[1]
			});
		});	
	},
	
	show : function() {

		// Hide some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
		$('embed, object, select').css({ 'visibility' : 'hidden' });
		$('body').append('<div id="'+this.overlayName+'"></div><div id="'+this.popupBoxName+'"><div id="'+this.popupName+'"></div></div>');	
		var arrPageSizes = this._getPageSize();
		// Style overlay and show it
		$('#'+this.overlayName).css({
			backgroundColor:	this.overlayBgColor,
			opacity:			this.overlayOpacity,
			width:				arrPageSizes[0],
			height:				arrPageSizes[1]
		}).fadeIn();
		
		
		var arrPageScroll = this._getPageScroll();
		// Calculate top and left offset for the jquery-lightbox div object and show it
		$('#'+this.popupBoxName).css({
			top:	arrPageScroll[1] + (arrPageSizes[3] / 10),
			left:	arrPageScroll[0]
		}).show();
		// Assigning click events in elements to close overlay
		$('#'+this.overlayName).click(function() {
			popup.hide();
		});
		
	},
	
	appendContent : function(element) {
		if(typeof(element.jquery) == 'string') {
			$('#'+this.popupName).append(element.html());
		} else if(typeof(element) == 'string') {
			$('#'+this.popupName).append(element);
		} else {
			$('#'+this.popupName).append($(element).html());
		}
	},

	appendFromUrl : function(url) {
	
	},
	
	hide : function() {
		$('#'+this.popupBoxName).remove();
		$('#'+this.overlayName).fadeOut(function() { $('#'+this.overlayName).remove(); });
		// Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
		$('embed, object, select').css({ 'visibility' : 'visible' });	
	},

	_getPageSize : function() {
		var xScroll, yScroll;
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		var windowWidth, windowHeight;
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}
		arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
		return arrayPageSize;
	},
	
	
	_getPageScroll : function () {
		var xScroll, yScroll;
		if (self.pageYOffset) {
			yScroll = self.pageYOffset;
			xScroll = self.pageXOffset;
		} else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
			yScroll = document.documentElement.scrollTop;
			xScroll = document.documentElement.scrollLeft;
		} else if (document.body) {// all other Explorers
			yScroll = document.body.scrollTop;
			xScroll = document.body.scrollLeft;	
		}
		arrayPageScroll = new Array(xScroll,yScroll);
		return arrayPageScroll;
	}
}