[punk23]

Ok, thank you.

So I am using this code now

<if condition="is_member_of($vbulletin->userinfo, 6,7,5,73)">
<div align="center">
<if condition="$vbulletin->options[mgc_cb_evo_fullmode_active] && THIS_SCRIPT != 'mgc_cb_evo'">
        <if condition="$vbulletin->options[mgc_cb_evo_fullmode_link_topopup]">
           <a href="mgc_cb_evo.php?$session[sessionurl]do=view_chatbox" target="_blank" onclick="return open_chatbox_window();"><img src="images/buttons/staff-chat.gif" width="160" height="33" border="0"/></a>
        <else />
           <a href="mgc_cb_evo.php?$session[sessionurl]do=view_chatbox" target="_top" onclick="return open_chatbox_window();"><img src="images/buttons/staff-chat.gif" width="160" height="33" border="0"/></a>            
        </if>
     </if></if></div>

But it's still opening up in a new tab

Just re-tested it - FF3 opens new tab & IE7 opens FULL SIZE new window.