jQuery.fn.showOverlay = function(options) {
   // instead of selecting a static container with 
   var container = this;
   
   var settings = jQuery.extend({
     imageLoading: 'img/loader.gif',
	 // Configuration related to overlay
	 overlayBgColor: '#000',	// (string) Background color to overlay; inform a hexadecimal value like: #RRGGBB. Where RR, GG, and BB are the hexadecimal values for the red, green, and blue values of the color.
	 overlayOpacity:	0.8		// (integer) Opacity value to overlay; inform: 0.X. Where X are number from 0 to 9
     // put more defaults here
   }, options);
   
   // ... the code start here ...
   $('body').append('<div id="jquery-overlay"></div><div id="jquery-lightbox"><div id="lightbox-loading"><a href="#" id="lightbox-loading-link"><img src="' + settings.imageLoading + '"></a></div></div>');	
	
	// Get page sizes
	var arrPageSizes = ___getPageSize();
	// Style overlay and show it
	$('#jquery-overlay').css({
		backgroundColor:	settings.overlayBgColor,
		opacity:			settings.overlayOpacity,
		width:				arrPageSizes[0],
		height:				arrPageSizes[1]
	}).fadeIn();
	// Get page scroll
	var arrPageScroll = ___getPageScroll();
	// Calculate top and left offset for the jquery-lightbox div object and show it
	$('#jquery-lightbox').css({
		top:	arrPageScroll[1] + ((arrPageSizes[3] - 100) / 10),
		left:	arrPageScroll[0]
	}).show();
	// Assigning click events in elements to close overlay
	$('#jquery-overlay,#jquery-lightbox').click(function() {
		$(this).removeOverlay();		
	});
	// Assign the removeOverlay function to lightbox-loading-link and lightbox-secNav-btnClose objects
	$('#lightbox-loading-link').click(function() {
		$(this).removeOverlay();
		return false;
	});
	// If window was resized, calculate the new overlay dimensions
	$(window).resize(function() {
		// Get page sizes
		var arrPageSizes = ___getPageSize();
		// Style overlay and show it
		$('#jquery-overlay').css({
			width:		arrPageSizes[0],
			height:		arrPageSizes[1]
		});
		// Get page scroll
		var arrPageScroll = ___getPageScroll();
		// Calculate top and left offset for the jquery-lightbox div object and show it
		$('#jquery-lightbox').css({
			top:	arrPageScroll[1] + (arrPageSizes[3] / 10),
			left:	arrPageScroll[0]
		});
	});
      
   	/**
	 / THIRD FUNCTION
	 * getPageSize() by quirksmode.com
	 *
	 * @return Array Return an array with page width, height and window width, height
	 */
	function ___getPageSize() {
		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;
	};
	
	/**
	 / THIRD FUNCTION
	 * getPageScroll() by quirksmode.com
	 *
	 * @return Array Return an array with x,y page scroll values.
	 */
	function ___getPageScroll() {
		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;
	};
   // if possible, return "this" to not break the chain
   return this;
};

/**
 * Remove jQuery lightBox & overlay effect
 *
 */
jQuery.fn.removeOverlay = function(options) {
	$('#jquery-lightbox').remove();
	$('#jquery-overlay').fadeOut(function() { $('#jquery-overlay').remove(); });
	// Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
	$('embed, object, select').css({ 'visibility' : 'visible' });
};