You're already relying on JavaScript to automatically move the user to a different URL (you're not really refreshing the page), so you could also pass selectedIndex.value in the query string of the URLs and then have PHP add selected="selected" to the appropriate <option> tag. Something like:
Code:
<select name="menu" onChange="location=document.form1.menu.options[document.form1.menu.selectedIndex].value + '&menuIndex=' + document.form1.menu.selectedIndex;">
If you do, it would be a good idea to add a rel="canonical" tag to the page that shows the URL without the 'menuIndex' value in the query string so that search engines don't see extra URLs in your site with the same content. Good luck!
Rick Trethewey
Rainbo Design
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