Converting a large PHP site into plain PHP is a suicide. Most likely the functionality currently handled by PHP you'd have to recreate in CGI. If you're comfortable with PERL, all the powers to you, if not -- learn PHP.

PHP is one of the greatest things that happen to WWW in the last decade.

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Site for sale: http://reviewgolf.com

"Web design is the area saturated by amateurs that confuse software capabilities with their own talent." ~~ me