iframe linking

I have a webpage that has two iframes -- one on the left containing treeview naviation html (eventually javascript) and a 'main' frame that displays the appropriate page. Nothing out of the ordinary. The problem is that about 10% of the time, the page that is supposed to open in the 'main' frame opens outside if the navigation frame -- all alone in the browser. The left-hand navigation and top frame disappear altogher. This is obviously not desireable. The tags I am using are something like this ...<br />
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<a TARGET="MAINFRAME" class="treenav" href=http://www.htmlforums.com/archive/index.php/"main.html">Users</a><br />
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<IFRAME NAME="MAINFRAME" ALIGN="left" VSPACE="0" HSPACE="0" WIDTH="772" HEIGHT="457" frameborder="0" SRC=http://www.htmlforums.com/archive/index.php/"default.html"></IFRAME><br />
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Has anyone else had this problem?<!--content-->looks ok to me, might want to make it lower case though<!--content-->
 
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