php ecommerce website add-ons

Skills required: PHP, MySQL, XHTML, CSS, OO, and DOM (modified implementation). The project is to provide add-ons to an existing ecommerce site: probably 6 weeks work. The programmer must have strong OO and W3C standards skills. The existing program design separates the content and the user interface in a sophisticated implementation. It was written in PHP 4, but uses OO techniques. Preference will be given to applicants with ZEND PHP Certification.