Your link is dead so we can't actually see the problem/s
However, if this the first time you've looked at this project in these browsers, I'd suggest you try the following to help track down where the worst problems are:
1. Make a copy of the page
2. In the code, start removing div elements one by one to narrow down the worst problems.
3. Work through your layouts like this until you identify the classes/IDs that have issues - fix the easy ones first
4. Post back here on specific errors you cannot solve by comparison. Some issues may require conditional CSS styling