var agent=navigator.appName.toLowerCase();
var append="";
//if(agent=="microsoft internet explorer")
//{
  append="px";	
//}

//alert(agent);
function openpopup(obj, popupWidth, popupHeight)
{

     //var screenW=screen.width;
     var actualH=document.documentElement.clientHeight;
     var actualW=document.documentElement.clientWidth;
//alert(actualW);

	var docLeft=parseInt((actualW-popupWidth)/2);
	var docTop=parseInt((actualH-popupHeight)/2);

        document.getElementById(obj).style.display="";
	document.getElementById(obj).style.left=docLeft + append;
	document.getElementById(obj).style.top=docTop + append;
	
	
 
}

function closepopup(obj)
{
	document.getElementById(obj).style.display="none";
}