categorybg as an image?

[TaP]

I have 3 images..like yaxay and fexboard...and i want to change my frontpage categorybg to an image...not change the bg..but just replace the whole thing with an image...here is what i have in my fourmhome_1_nopost....I have 3 images a.gif, b.gif, and c.gif....b.gif being a gradient stretchin all the way across between a and c....

</table>
</td></tr></table><br>
<table cellpadding="{tableouterborderwidth}" cellspacing="0" border="0" bgcolor="{tablebordercolor}" {tableouterextra} width="{contenttablewidth}" align="center"><tr><td>
<table cellpadding="4" cellspacing="{tableinnerborderwidth}" border="0" {tableinnerextra} width="100%">


<tr id="cat">
    <td bgcolor="{categorybackcolor}" colspan="6"><a href="forumdisplay.php3?s=$session[sessionhash]&forumid=$forum[forumid]"><normalfont color="{categoryfontcolor}"><b>$forum[title]</b></normalfont></a>
    <br><smallfont color="{categoryfontcolor}">$forum[description]</smallfont></td>
</tr>
<tr align="center">
  <td bgcolor="{tableheadbgcolor}"><smallfont> </smallfont></td>
  <td bgcolor="{tableheadbgcolor}" width="80%" align="left"><smallfont color="{tableheadtextcolor}"><b>Forum</b></smallfont></td>
  <td bgcolor="{tableheadbgcolor}"><smallfont color="{tableheadtextcolor}"><b>Posts</b></smallfont></td>
  <td bgcolor="{tableheadbgcolor}"><smallfont color="{tableheadtextcolor}"><b>Threads</b></smallfont></td>
  <td bgcolor="{tableheadbgcolor}" width="170" nowrap><smallfont color="{tableheadtextcolor}"><b>Last Post</b></smallfont></td>
  <td bgcolor="{tableheadbgcolor}" width="20%"><smallfont color="{tableheadtextcolor}"><b>Moderator</b></smallfont></td>
</tr> 

Thanks!