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;
		}

		var arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
		return arrayPageSize;
}; 


$(document).ready(function(){
  var arrayPageSize = getPageSize(); 

  var cookieName = "closeit";
  var clickedCookie = $.cookie(cookieName);

  if (clickedCookie != 'true') {
  	$("#overlay").css({width: '100%', height: arrayPageSize[1]+'px', opacity: '0.6'}).fadeIn("slow");   
    $("#nllayer").animate({"left": "50%"}, "slow");

    // register function for click event
    $("#closeit").click(function() {
      // hide the image
      $("#nllayer").animate({"left": "-250px"}, "slow");
      // fade out overlay
    	$("#overlay").fadeOut("slow");
      // set a cookie   
      $.cookie(cookieName, 'true');
    });
  }
});