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 { // 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
		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 = windowWidth;
	} else {
		pageWidth = xScroll;
	}


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

function switchOverlay() {
	

	var overlay = document.getElementById("overlay");
	
	if (overlay.style.visibility == 'visible') {
		
		overlay.style.visibility = 'hidden';

	} else if (overlay.style.visibility == 'hidden') {

		arrayPageSize = getPageSize();

		overlay.style.visibility = 'visible';
		overlay.style.height = arrayPageSize[1]+"px";

	}

}

function switchMessageWindow() {

	var messagewindow = document.getElementById("messagewindowcontainer");
	
	if (messagewindow.style.visibility == 'visible') {
		messagewindow.style.visibility = 'hidden';
	} else if (messagewindow.style.visibility == 'hidden') {
		messagewindow.style.visibility = 'visible';
	}

}

function switchMessageWindowLoadStatus(elemname) {

	var messagewindow = document.getElementById("messagewindow");
	messagewindow.innerHTML = '<div class="loading"></div>';
	positionDiv();

}

function refreshElem(elem) {

	var reg = new RegExp(/\?/i);
	if (reg.test(url))
		makeRequest(url + '&refresh=1&rand=1512560651', elem);
	else
		makeRequest(url + '?refresh=1&rand=1278348156', elem);

}

function positionDiv() {

	//define universal reference to "staticcontent"
	var crossobj=document.all? document.all.messagewindowcontainer : document.getElementById("messagewindowcontainer")

	//define reference to the body object in IE
	var iebody=(document.compatMode && document.compatMode != "BackCompat")? document.documentElement : document.body

	//define universal dsoc top point
	var dsoctop=document.all? iebody.scrollTop : pageYOffset

	//if the user is using IE 4+ or Firefox/ NS6+
	if (document.all||document.getElementById){
	crossobj.style.top=dsoctop+150+"px"
	}

}

function display_bg(elem, url) {

	document.getElementById(elem).style.backgroundImage = 'url("' + url + '");';

}