function openWindow(URL,popupname,b,h,sb)
{
 var PopUpName = popupname || 'PopUp';
 var breite = b || 410;
 var hoehe = h || 450;
 var scrolling = 'no' || sb
 var xPos = (screen.availWidth - breite) / 2
 var yPos = (screen.availHeight - hoehe ) / 2
 window.open(URL,PopUpName,'width='+breite+',height='+hoehe+',scrollbars='+scrolling+',toolbar=no,menubar=no,screenX='+xPos+',screenY='+yPos+',left='+xPos+',top='+yPos)
}