function Saal(b,h,s,o) {
var b = 800;
var h = 600;
var s = (screen.availWidth - b) / 2;
var o = (screen.availHeight - h) / 2;
params = ('width='+ b +',height='+ h +',left='+ s +',top='+ o);
FensterSaal = window.open('uploads/saal.htm','Saal',params);
}

function popup (url) {
fenster = window.open(url, "Popupfenster", "width=200,height=100,resizable=yes");
fenster.focus(); return false;
}