function openwindow(url,w,h)
{

  var winwidth = screen.availWidth;
  var winheight = screen.availHeight;
  var leftt=Math.floor((winwidth/2)-(w/2));
  var topt=Math.floor((winheight/2)-(h/2));
  window.open(url,'popup','left='+leftt+',top='+topt+',width='+w+', height='+h+', toolbar=0,  location=0, directories=0,status=0, titlebar=0, menubar=0, resizable=1, scrollbars=1')
};


function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 // Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}


	function request(params)
	{
		
			var xmlHttp;
		  xmlHttp=GetXmlHttpObject();
		  xmlHttp.open("GET",params,false);
  		xmlHttp.send(null);
			return xmlHttp.responseText;

	}