You appear to be trying to show the menu your are already in, which is
wrong.
If you are adding a behaviour to a link in the mainmenu, you should be
changing visibility of the leaf, not the mainmenu. Additionally, as you
move around the mainmenu, you should be hiding one leaf as you show the
next.
Thus where you have:
<div style="position: absolute; top: 28px; left: 6px; z-index: 2"
id="Mainleaf">
<table border="1" width="100%" id="table1">
<tr>
<td>
<a href="javascript:;"
onmouseover="FP_changeProp(/*id*/'Mainleaf',0,'style.visibility','visible','visibility','show')">
Column 1</a></td>
<td>
<a href="javascript:;"
onmouseover="FP_changeProp(/*id*/'Mainleaf',0,'style.visibility','visible','visibility','show')">
Column 2</a></td>
</tr>
</table>
</div>
you should have:
<div style="position: absolute; top: 28px; left: 6px; z-index: 2"
id="Mainleaf">
<table border="1" width="100%" id="table1">
<tr>
<td>
<a href="javascript:;"
onmouseover="FP_changeProp(/*id*/'leaf1',0,'style.visibility','visible','visibility','show');
FP_changeProp(/*id*/'leaf2',0,'style.visibility','hidden','visibility','hide')">">
Column 1</a></td>
<td>
<a href="javascript:;"
onmouseover="FP_changeProp(/*id*/'leaf2',0,'style.visibility','visible','visibility','show');
FP_changeProp(/*id*/'leaf1',0,'style.visibility','hidden','visibility','hide')">
Column 2</a></td>
</tr>
</table>
</div>
In the leaves, you appear to be trying to hide them as soon as you mouse
over a link in the leaf. In your menu the links in the leaves should not
have any behaviours added at all, the leaf visibility manipulation should be
in the mainmenu.
The leaves should be:
<div style="position: absolute; top: 60px; left: 7px; z-index: 3;
visibility: hidden" id="leaf1">
<table border="1" width="100%" id="table2">
<tr>
<td>
<a href="file:///D:/My%20Documents/DDSWeb/test_2a.htm"> Row 1</a></td>
</tr>
<tr>
<td>
<a href="file:///D:/My%20Documents/DDSWeb/test_2b.htm" > Row 2</a></td>
</tr>
</table>
</div>
<div style="position: absolute; top: 59px; left: 291px; z-index: 4;
visibility: hidden" id="leaf2">
<table border="1" width="100%" id="table3">
<tr>
<td>
<a href="file:///D:/My%20Documents/DDSWeb/test_3.htm"> Row 3</a></td>
</tr>
<tr>
<td>
<a href="file:///D:/My%20Documents/DDSWeb/test_3a.htm"> Row 4</a></td>
</tr>
</table>
</div>
</body>
See
www.rxs-enterprises.org/tests/pages/column_1.htm