Website working perfectly with IE8 but not working when using the compatibility view

I've created a website (main page) that works perfectly on IE8 but not when I'm u开发者_JAVA百科sing the compatibilty view to emulate IE7 (the design of the page is messy).

Compatibility View Screenshot:

(Cropped form elements in "Votre situation familiale" section, tabs floating at top of page, mis-aligned "Demande de devis" button)

I really have no idea of how to correct this and I'm wondering if you guys have already met a similar situation and how you solved it.

Have a read through a list of common IE CSS bugs, learn about having layout and consider using conditional comments to feed a different stylesheet to older versions of IE.