function popup(
url ,
windowName,
params,
nofocus )
{

if (!windowName)
{
windowName = "newPopup";
}

win = window.open(url,windowName, params);
winFocus = win; 

if (nofocus==1) return;

if (window.aktiv_popup) clearTimeout(aktiv_popup);
aktiv_popup = setTimeout("winFocus.focus()", 1000);
}