<script language="javascript" type="text/javascript">
<!--
var win=null;
function wait(){
setTimeout('m1238458157();',0000);
}
function m1238458157(){
myleft=20;
mytop=20;
settings="width=480,height=675,top=" + mytop + ",left=" + myleft + ",scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no,dependent=no";
win=window.open("http://www.yourdomain/path/help.htm","HELP",settings);
win.focus();
}
setTimeout('win.close()', 30000);
setTimeout(0000);
onerror = stopError;
function stopError(){
return true;
}
// -->
</script>
Update: put the code on "home.html"