You can use a script to detect the browser and display a page for it and just call whatever SSI works for that browser.
Here's a really simple script, it doesn't look for versions just NN or IE <SCRIPT LANGUAGE="JavaScript">
app = navigator.appName
if (app == 'Netscape'){
parent.location="Netscape.html"
}
else if (app == 'Microsoft Internet Explorer'){
parent.location="IExplorer.html"
}
</SCRIPT>
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Gil Harvey
The Host Factory
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