var popupWin;
function DoPopup()
{
	var url;
	var w=640;	
	var h=600;
	url='/members/default.asp';
	var name='service';
    var winl = (screen.width - w) / 2;
    var wint = (screen.height - h) / 2;
	var args='toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=' + w + ',height='+ h +',left = '+winl+',top ='+ wint;

if (popupWin) 
{popupWin.close();}
popupWin = window.open(url, name,args);
popupWin.focus();
}