Fjerne det nederste i en popup (statusbar)

HeyZa =)


<script type="text/javascript">

function chat(url,name,win_height,win_width) {
    pos_horizon = ((screen.width/2)-(win_width/2));
    pos_vertical = ((screen.height/2)-(win_height/2));
    window.open(url,name,"width="+win_width+",height="+win_height+",top="+pos_vertical+",left="+pos_horizon);
    }

</script>
<CENTER>
<A HREF="#" onclick="chat('chat.php','webgh33ostchatten2','520','700');">Chat</A>


Hvordan laver man så den nederste "statusbar" forsvinder?