function popup(bild, titel, breite, hoehe)
{
var nw,nwparams;
titel = titel + ' (' + breite + 'x' + hoehe + ')';
nwparams='scrollbars=no,width=' + breite + ',height=' + hoehe + ',screenX=' + (screen.width-breite)/2 + ',screenY=' + (screen.height-hoehe)/2 + ',left=' + (screen.width-breite)/2 + ',top=' + (screen.height-hoehe)/2;
nw=window.open('','',nwparams);
nw.document.open();
nw.document.write('\n');
nw.document.write('\n' + titel + '\n\n');
nw.document.write('\n');
nw.document.write('
\n');
nw.document.write('\n');
nw.document.write('\n');
nw.document.close();
nw.focus();
}