Site looks perfect in ie7 and but Terrible in ie6 (white spaces)

[made4net]

Hi there

Does anyone know how to fix this problem I’ve tried everything
But nothing worked

My website is http://www.gaconstructioninc.com

I attached the screenshots of how its look like in both browsers as you can see
In ie6 goes under the menu, the menu looks Terrible and there is a white space between the header
And the menu

Any help will be appreciated

Regards,
Tom

[Dr.CSS]

If you remove the validation errors it may help...

http://validator.w3.org/check?verbose=1 ... inc.com%2F

?why use tables?...

[made4net]

hi there and thank you for helping me

can you please tell where do i find this line

Regards,
Tom