how do you make headers change on refresh?

[xfords.com]

i have three parts to my header logo, i want to get the side part of my header to change to random pics with a refresh. could some one drop some instructions on how to do this please.
thanx in advance

if you need to see what my banner looks like www.xfords.com where the red car is on banner i want to change on refresh to next picture

[MoT3rror]

You can base it off of something like this.
https://vborg.vbsupport.ru/showpost.php?p=1059879&postcount=5

[xfords.com]

<!-- logo -->
<a name="top"></a>
<table border="0" width="$stylevar[outertablewidth]" cellpadding="0" cellspacing="0" align="center">
<tr>
<td width="448"><a href="/forum/index.php"><img src="/forum/images/xfords_header.jpg" border="0" height="180" width="448" alt="$vboptions[bbtitle]" /></a></td>
<td style="background: url(/forum/images/xfords_bg.jpg)">&nbsp;</td>
<td width="304"><img src="/forum/images/xfords_right.jpg" border="0" height="180" width="304" alt="" /></td>
</tr>
</table>
<!-- /logo -->

<!-- content table -->
$spacer_open

$_phpinclude_output

$ad_location[ad_header_end]

how would i add taht into my current header coding? also thanx for the fast reply mot3rror
xfords_right.jpg is the image i wish to change randomly

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any one???