Random logo help please

[DarKNull]

Below is the code currently i have on my header.

<!-- logo -->
<a name="top"></a>
<div id="vbwrapper">
<div id="logostrip"><center><div style="background: url($stylevar[imgdir_misc]/desi2.gif) no-repeat;width:100%;height: 158px"></div></div>
<div id="submenu"><a href="search.php?$session[sessionurl]"><img src="$stylevar[imgdir_misc]/submenu_search.gif" alt="desi" /></a><a href="memberlist.php?$session[sessionurl]"><img src="$stylevar[imgdir_misc]/submenu_members.gif" alt="desi" /></a><a href="calendar.php?$session[sessionurl]"><img src="$stylevar[imgdir_misc]/submenu_calendar.gif" alt="desi" /></a><a href="faq.php?$session[sessionurl]"><img src="$stylevar[imgdir_misc]/submenu_faq.gif" alt="desi" /></a></div></center>
<div id="vbwrapper2">
<div id="vbwrapper3">
<div id="bordertop"><div id="bordertopleft"><img src="$stylevar[imgdir_misc]/border_top_l.gif" alt="desi" /></div><div id="bordertopright"><img src="$stylevar[imgdir_misc]/border_top_r.gif" alt="desi" /></div></div>
<div id="vbwrapper4">
$spacer_open
<!-- content table -->

$_phpinclude_output


currently i have installed this hack:
https://vborg.vbsupport.ru/showthread.php?t=103477&highlight=brotator
i have been told to find:
<img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" />

and Replace with
<center>$banner</center>

Now how do i implant this $banner into my current code so random banner from my list would work ;) please help me