function getPageSize(){
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {
xScroll = document.body.scrollWidth;
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 if (document.documentElement && document.documentElement.scrollHeight > document.documentElement.offsetHeight){ // Explorer 6 strict mode
xScroll = document.documentElement.scrollWidth;
yScroll = document.documentElement.scrollHeight;
} else { // Explorer Mac...would also work in Mozilla and Safari
xScroll = document.body.offsetWidth;
yScroll = document.body.offsetHeight;
}
var windowWidth, windowHeight;
if (self.innerHeight) { // all except Explorer
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;}
if(yScroll < windowHeight){pageHeight = windowHeight;} else {pageHeight = yScroll;}
if(xScroll < windowWidth){pageWidth = windowWidth;} else {pageWidth = xScroll;}
arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
return arrayPageSize;
}
var overlays = 1;
function overlay(){
	var aPS = getPageSize();
	if(overlays == 1){
	$("body").append('<iframe id="overlay_hs" style="height:'+aPS[1]+'px; width:'+aPS[0]+'px;"></iframe><div id="overlay" style="height:'+aPS[1]+'px; width:'+aPS[0]+'px;" ></div>');
	overlays = 2;}
 }
function remove_overlay(){
	$("#overlay,#overlay_hs").hide();
	$("#overlay,#overlay_hs").remove();
	overlays = 1;
}