Joomla template Fix layout

I have a joomla template that I downloaded from [login to view URL], I am modified the template to have different colors, images and menu sizes, I ma unable to fully cusomize it, the job will be to make sure that the design of the page renders properly in IE7,8, MOZILLA, chrome, and safari. The website layout is basic left column navigation menu and content template can be found here [login to view URL] I already modified it but I have css style errors, page does not display properly