Put images in same td but dont align left. This seems to work when tested in IE and FF. As this:
<!--END OF NAVIGATION-->
</td>
</tr>
<tr>
<td colspan=5>
<img alt="" src="images/image_05.jpg" width=156 height=168><img alt="" src="images/image_06.jpg" width="155" height="168"></td>
<td rowspan=3 style="background:url('images/image_07.jpg');padding-top:15px;" valign="bottom" align="left">
<IFRAME SRC="home.
html"width=642 height=461 NAME=A FRAMEBORDER=0 SCROLLING=AUTO ALLOWTRANSPARENCY=TRUE STYLE="filter: chroma(COLOR=#000000);"></IFRAME></td>
</tr>
<tr>
<td colspan=5>
<img alt="" src="images/image_08.jpg" width=156 height=150><img alt="" src="images/image_09.jpg" width=155 height=150></td>
</tr>
<tr>
<td colspan=5>
<img alt="" src="images/image_10.jpg" width=156 height=168><img alt="" src="images/image_11.jpg" width=155 height=168></td>
</tr>