Cross browser HTML/CSS web developer

Our site uses only 2 HTML/CSS layouts. That is all pages on the site have only 2 fundamental HTML/CSS structures/holders to show any/all content. The site shows up fine on the latest version of Firefox. However on IE 6.0 it has issues. For example the side boxes are flowing to the bottom of the page on IE 6.0 (may be CSS width interpretation issue). We need some one experienced in fixing cross browser issues by potentially modifying CSS or HTML or adding some browser/version dependent Javascript etc. Our site's look & feel should be good on IE 6.0+ and Firefox 2.0+. Some one familiar with fixing cross browser issues should take may be 2-4 hours to fix our CSS or suggest HTML etc. modifications. The budget for this project calculated at $10/hr is $40.