var Fenster=null;
function neuesFenster(meineSeite,meinName,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
scroll= 'yes';
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+''; 
Fenster = window.open(meineSeite,meinName,settings);
}