function openWindow( pageUrl , popupwidth , popupHeight )
{
	popupLeft = (screen.availWidth/2)-(popupwidth/2);
	popupTop = (screen.availHeight/2)-(popupHeight/2);
	Features = "resizable=1,scrollbars=0,width=" + popupwidth + ",height=" + popupHeight + ",left=" + popupLeft + ",top=" + popupTop;

	//Open-close-open to ensure the popup is on top.
    var window1;
	window1 = window.open( "about:blank" , "window1" , Features);
	window1.close();
	window1 = window.open( pageUrl , "window1" , Features);
	
}