// Pop-Up Fenster oeffnen
function openFenster(goURL, goWidth, goHeight, goTitle) {
   var padding;
   (navigator.appName == "Microsoft Internet Explorer") ? (padding = 10) : (padding = 0);

   // Fensterdimensionen berechnen
   var screenw = screen.availWidth;
   var screenh = screen.availHeight;
   var winw = (goWidth + 15 + padding);
   var winh = (goHeight + 30 + padding);
   var posx = (screenw / 2) - (winw / 2);
   var posy = (screenh / 2) - (winh / 2);

   // Inhalt bestimmen
   var mywin = window.open(goURL,"mywin","top="+posy+",left="+posx+",width="+winw+",height="+winh+",menubar=no,locationbar=no,statusbar=no,resizable=no,toolbar=no,dependent=yes,scrollbars=no");
   mywin.document.write("<p style=\"text-align: center\"><img src=\""+goURL+"\" border=\"0\" alt=\"\" /></p>\n<p style=\"text-align: center\">"+goTitle+"</p>\n");
   mywin.document.close();
   mywin.focus();
}