var viewportwidth;
var viewportheight;

// the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
function doOnResize()
{
	//alert("onResize called");
	if (typeof window.innerWidth != 'undefined')
	{
	     viewportwidth = window.innerWidth,
	     viewportheight = window.innerHeight
	}
	
	//IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
	
	else if (typeof document.documentElement != 'undefined'
	    && typeof document.documentElement.clientWidth !=
	    'undefined' && document.documentElement.clientWidth != 0)
	{
	      viewportwidth = document.documentElement.clientWidth,
	      viewportheight = document.documentElement.clientHeight
	}
	
	// older versions of IE
	
	else
	{
	      viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
	      viewportheight = document.getElementsByTagName('body')[0].clientHeight
	}
}
function loadAsynchronousDataAsText(url, callBackFunction) {
	var xmlhttp;
	if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
		xmlhttp = new XMLHttpRequest();
	} else {// code for IE6, IE5
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			callBackFunction(xmlhttp.responseText);
		}
	}
	xmlhttp.open("GET", url, true);
	xmlhttp.send();
}
function loadAsynchronousData(url, callBackFunction) {
	var xmlhttp;
	if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
		xmlhttp = new XMLHttpRequest();
	} else {// code for IE6, IE5
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			callBackFunction(xmlhttp.responseXML);
		}
	}
	xmlhttp.open("GET", url, true);
	xmlhttp.send();
}
function loadSynchronousData(url) {
	var xmlhttp;
	if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
		xmlhttp = new XMLHttpRequest();
	} else {// code for IE6, IE5
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.open("GET", url, false);
	xmlhttp.send();
	return xmlhttp.responseXML;
}
function postAsynchronousData(url, params, callBackFunction) {
	//alert("called" + callBackFunction);
	var xmlhttp;
	if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
		xmlhttp = new XMLHttpRequest();
	} else {// code for IE6, IE5
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			callBackFunction(xmlhttp.responseText);
		}
	}
	//alert("about to send");
	xmlhttp.open("POST", url, true);
	xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlhttp.setRequestHeader("Content-length", params.length);
	xmlhttp.setRequestHeader("Connection","close");
	//alert("about to send");
	xmlhttp.send(params);
	//alert("sent");
}