valid XHTML Catalog Side 2.3

for osCommerce Online Merchant v2.2

This contribution validates the catalog side only under XHTML. Also took the liberty of correcting the following things: * improperly nested tags * missing start/end tags * product_listing.php no longer creates urls with the category, only appends product_id to url. Search engines frown upon multiple copies of the same file, which is exactly how it appears as default. * fixing all calls to scripts * Relieving the stylesheet of the reduncy in attributes (font-family was declared 36 times!) This is meant for a fresh install of ms2 as it is a direct replacement of files. Can also use a file comparison utility of course.

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