I have an existing website in closed beta testing right now.
The website works fairly well with IE 8, Firefox 3.5.4, Safari 4.0.3, Chrome 4.1.2.
It does not work well with IE6, IE7, Firefox 3.3 and has not been tested in other earlier versions.
The problems are mainly CSS and JQuery related.
I will not be able to provide the entire code base - but depending upon which pages dont work - I can provide the code for those pages.
The person should be able to fix the issues and test them in all major browser versions.