function PopUp(w,h,furl){
	var width=w;
	var height=h;
	var url='popup.php?file='+furl;
	
	var iLeft = (screen.width  - width ) / 2 ;
	var iTop  = ( screen.height - height ) / 2 ;
	var sOptions = "toolbar=no,status=no,resizable=yes,dependent=yes,scrollbars=yes" ;
	sOptions += ",width=" + width ;
	sOptions += ",height=" + height ;
	sOptions += ",left=" + iLeft ;
	sOptions += ",top=" + iTop ;
		if(oWindow){
		oWindow.location.href=url;
		oWindow.focus();
		}else{
		var oWindow = window.open( url, 'Popup', sOptions ) ;
		}
}