function window_open(psURL,psName,pnWidth,pnHeight,pnTop,pnLeft,pbScroll){
	var nLeft=pnLeft || Math.round((window.screen.width-pnWidth)/2);
	var nTop=pnTop || Math.round((window.screen.height-pnHeight)/2)-20;	
	if (psName=="") psName=null;
	var oWindow=window.open(psURL,psName,"top="+nTop+",left="+nLeft+",height="+pnHeight+",width="+pnWidth+",status=no,toolbar=no,menubar=no,location=no,resizable=no"+((pbScroll)?",scrollbars=no":""));
	oWindow.focus();
}