function popChat(mylink, windowname)
{
if (! window.focus)return true;
var href;
var winX = 0;
var winY = 0;
if (parseInt(navigator.appVersion) >= 4)  {
   winX = (screen.availWidth - 450)*.5;
   winY = (screen.availHeight - 300)*.5;
}
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;
window.open(href, windowname, 'width=450,height=300,left=' + winX + ',top=' + winY + ',resizable=yes,scrollbars=yes');
return false;
}