HTML/CSS fix/cross browser support on existing website

Hi, I need to fix [login to view URL] website HTML/CSS to new standards and makit it valid and nicely visible on all browsers. Please let me know if you are capable of doing such thing and would like to have this task. To slice it up from scracth it would be to big job so i would like to try to fix it all manually. I should have PSD somewhere in case you need it. But most important part is HTML and CSS. This Saturday/Sunday task. Please let me know if you can start today, work on live server and finish it quite soon. I'll be on vworker chat today so we could talk about details live. Thank you. I prefer to work with fair individuals instead of ISO certified companies:) Looking forward to work with you Edvardas