//Öffnen eines Bildes
function open_pic(picnr,mywidth,myheight)
 {
 posX = (screen.Width-mywidth)/2;
 posY = (screen.Height-myheight)/2;
 window.open('pic.php?pic=' + picnr + '','pic','height=' + myheight + ',width=' + mywidth + ',scrollbars=no,screenX=' + posX + ',screenY=' + posY + ',top=' + posY + ',left=' + posX + '');
 }