I would perhaps redesign the header and footer, using gradient colours for the orange, so it fades to a background colour for the body.
Instead of putting hyperlinks throughout the text in the body and having a menu at the bottom, I would consolidate everything in to the main menu in the header. I feel having navigation in the header and footer, is very messy.
Also don't discount IE6 users. Many still use it. Especially in companies where they have software reliant on IE6. So for instance, if the government in NZ has a cycle to work scheme for giving tax breaks to workers buying bikes, you are effectively neglecting that entire market, as they can't browse the site from work. A lot more than 1% of users, use IE6. As I said, up to 50% in your demographic or more could use IE6.
Yes it is annoying when IE6 goes in to quirk mode, but stick with it.
99 little bugs in the code, 99 bugs in the code, fix one bug, compile it again ... 101 little bugs in the code
It looks like orange colour is really in trend! I didn't really like your design to be honest, the colour combination and letters, most probably you must have used some template. As the website represents many different brands and goods, the design should be something neutral, for example something like amazon.com. Wish you best of luck!