[HolyKiller]

Thanks for mod, but there is a little problem in comment tag.
Like Birched said, comment tag in HTML is NOT <!-- blabla --!> but <!-- blabla -->.

So, remove the second ! or just copy/paste this:

<!-- / start - happy extra modoption -->
<if condition="in_array($post[usergroupid], array(2))"><if condition="in_array($bbuserinfo['usergroupid'], array(6))">
<tr><td class="thead"><strong><u>Extra Modoption</u></strong></td></tr> 
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/banning.php?do=banuser&userid=$post[userid]','ban','width=500,height=350,scrollbars=yes')"><strong>Ban: $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/banning.php?do=liftban&userid=$post[userid]','ban','width=500,height=350,scrollbars=yes')"><strong>Unban: $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/user.php?do=editsig&userid=$post[userid]','edit','width=500,height=350,scrollbars=yes')"><strong>Edit Signature from $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/user.php?do=avatar&userid=$post[userid]','edit','width=500,height=350,scrollbars=yes')"><strong>Edit Avatar from $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/user.php?do=profilepic&userid=$post[userid]','edit','width=500,height=350,scrollbars=yes')"><strong>Edit Profilpic from $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><strong>IP-Adress from $post[username]: $post[ip]</strong></td></tr></if></if>
<!-- / end - happy extra modoption -->

Anyway, i think, better to use 640*480 popup size instead of 500*300, so here is modifed code

<!-- / start - happy extra modoption -->
<if condition="in_array($post[usergroupid], array(2))"><if condition="in_array($bbuserinfo['usergroupid'], array(6))">
<tr><td class="thead"><strong><u>Extra Modoption</u></strong></td></tr> 
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/banning.php?do=banuser&userid=$post[userid]','ban','width=640,height=480,scrollbars=yes')"><strong>Ban: $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/banning.php?do=liftban&userid=$post[userid]','ban','width=640,height=480,scrollbars=yes')"><strong>Unban: $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/user.php?do=editsig&userid=$post[userid]','edit','width=640,height=480,scrollbars=yes')"><strong>Edit Signature from $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/user.php?do=avatar&userid=$post[userid]','edit','width=640,height=480,scrollbars=yes')"><strong>Edit Avatar from $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><span onmouseover="this.style.cursor='hand';" onClick="window.open('modcp/user.php?do=profilepic&userid=$post[userid]','edit','width=640,height=480,scrollbars=yes')"><strong>Edit Profilpic from $post[username]</strong></span></td></tr>
<tr><td class="vbmenu_option"><strong>IP-Adress from $post[username]: $post[ip]</strong></td></tr></if></if>
<!-- / end - happy extra modoption -->

Enjoy