function setscroll(div)
	{
	var div=document.getElementById(div);	
	var scrolly = 0;
	var scrollx = 0;
	if (document.documentElement.scrollTop>0)
		{ 
		var scrolly = document.documentElement.scrollTop;
		var scrollx = document.documentElement.scrollLeft;
		}
		else if (window.pageYOffset>0)
		{ 
		var scrolly = window.pageYOffset;
		var scrollx = window.pagexOffset;
		}
	div.style.top=(scrolly+(window.screen.height/3))+"px"; 
	div.style.left=(scrollx+(window.screen.width/3))+"px"; 
	}

function displayloading(loadingtext)
{
var statusdiv=document.getElementById("loading");
statusdiv.innerHTML=loadingtext;
statusdiv.style.visibility = 'visible';
setscroll("loading");
}

function request(url, callback_function, return_xml, post, parameters)
{
var statusdiv=document.getElementById("loading");
displayloading("Loading, Please Wait.");
   var http_request = false;

   if (window.XMLHttpRequest) { // Mozilla, Safari,...
       http_request = new XMLHttpRequest();
       if (http_request.overrideMimeType) {
           http_request.overrideMimeType('text/xml');
       }
   } else if (window.ActiveXObject) { // IE
       try {
           http_request = new ActiveXObject("Msxml2.XMLHTTP");
       } catch (e) {
           try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
           } catch (e) {}
       }
   }
  
   if (!http_request) {
       alert('Unfortunatelly you browser doesn\'t support this feature.');
       return false;
   }
   http_request.onreadystatechange = function() {
       if (http_request.readyState == 4) {
           if (http_request.status == 200) {
               if (return_xml) {
                   eval(callback_function + '(http_request.responseXML)');
               } else {
                   eval(callback_function + '(http_request.responseText)');
               }
			  statusdiv.style.visibility = 'hidden';
           } else {
               alert('There was a problem with the request.(Code: ' + http_request.status + ')');
           }
       }
   }
   if(post)
	   {
		http_request.open('POST', url, true);
		http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http_request.setRequestHeader("Content-length", parameters.length);
		http_request.setRequestHeader("Connection", "close");
		http_request.send(parameters);
	   }else
	   {
	   http_request.open('GET', url, true);
	   http_request.send(null);
	   }

}