var Fenster = null;

function neuesFenster(meineSeite,meinName,w,h,scroll,resizable){

LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;

settings ='height='+h+',width='+w+',top='+TopPosition+
',left='+LeftPosition+',scrollbars='+scroll+',resizable='+resizable+''
Fenster = window.open(meineSeite,meinName,settings)
}