/*--- zentriertes Pop-Up ---*/
var Fenster = null;
function WindowOpen(url,windowname,w,h){
  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=no,resizable' 

  Fenster = open(url,windowname,settings);
  Fenster.focus();
}
function WindowOpenWithScrollbar(url,windowname,w,h,scrollbars){
  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='+scrollbars+',resizable'
  
  Fenster = open(url,windowname,settings);
  Fenster.focus();
}