Joomla Template CSS modifications ( errors)

We need a joomla template to be corrected. This template has been adapated from a Yoo template, by modifying backgrounds, colors and adding a menu with background images. However, we have a lot of errors * When displaying modules on (left or right) positions, * Errors with this image background menu ( float on right on IE). Menu images only appears for a somes Menu ID's (so i have to modify ID in database) The template need to be cleaned, tested and then be fully functionnal on major browsers I can send template files by MP and an URL to see somes troubles