function openWin(filename,winname,w,h) {
	if (w == null || h == null)
	{
		w=800; 
		h=550; // Groesse des Popups
	}
	if (winname == null) winname= "PopUp"
	var l=(screen.width) ? (screen.width-w)/2 : 0;
	var t=(screen.height) ? (screen.height-h)/2 : 0;
	var win= window.open(filename, winname, "toolbar=no,scrollbars=no,location=no,directories=no,status=no,menubar=no,resizable=yes,width="+w+",height="+h+",left="+l+",top="+t);
	var z=parseFloat(navigator.appVersion);
	if (navigator.appName.substring(0,8) == "Netscape" || z > 4)
	{
		win.focus();
	}
}