Need help with cross browser support

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Hi guys, not sure exactly if this is a CSS issue or not as it might be javascript as well.

Anyway I have a site I have been doing in Joomla and using a modified Rocket Theme template that works well on a PC with FF 3.5.2 and IE8 but when I take a look at it with www.browsershots.com and the various browsers it show many errors and blank pages, especially for Macs as my client is on a Mac and they get blank pages.

I am stuck and cannot for the life of me work it out.

I am willing to pay a fee to have this fixed so if you can take a look and quote me or simply tell me what I have wrong in the code would be greatly appreciated.

The dev site is as (removed link - I am in the process of doing a new template as I could not figure this one out)

Cheers