The only place I found to replace the image source was in the menu.tpl. When I changed it, it changed the title to all my other title headers.
Here's what's contained in the menu.tpl...
<table border="0" cellpadding="0" cellspacing="0" style="width:100%;">
<tr>
<td style="width:100%;"><TABLE border="0" cellpadding="0" cellspacing="0" style="width:100%;">
<tr>
<TD style="width:100%;">
<img src="{$ImagesDir}/{if $dingbats ne ''}{$dingbats}{else}spacer.jpg{/if}" width="170" height="26" border="0" />{if $link_href}
{$menu_title}
{else}
<font class="VertMenuBoxNewsTitle">{$menu_title}</font>
{/if}</td>
</tr>
</table></td>
</tr>
<tr>
<td class="VertMenuBox">
{$menu_content}
</td></tr>
</table>