I would of suggested wrapping a div with float: left around #sidebar_a and #content so when worse came to worse you forced #sidebar_b below the main content.

However, that would require a major change in your source code. And seeing your are already using conditional comments to serve a .htc behaviour to ie only.  Why not add another for min-width options:
grab ie7 behaviours from Dean Edwards http://dean.edwards.name/IE7/
try this one it is much smaller but untested  http://archivist.incutio.com/viewlist/css-discuss/42236
or just add the following into you conditional comment:
<style type="text/css">
.minWidth{
width:_expression_(document.body.clientWidth < 800 ? "800px": "auto" );
}
</style>




--
Nick Cowie
http://nickcowie.com

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