update page in php,css, javascript

we have a working webpage which we want to update. the reason for update is to make the code w3c complaint, seo crawl friendly with good coding, and make code shorter and easier to load. there are also few new features to add to the page. the current code is working perfectly, but the selected coder would make a new file completely from scratch. do not use the current code. i am attaching the details of the site in the file along with necessary updates. you need to be proficient in html, css, javascript, php and mysql. work should be done within 3 days.