Internet Explorer compatibility disaster
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I'm in a completely disastrous situation right now.

According to Google Analytics, 96% of the users to my site are on Chrome & Firefox. However, we have one very important client coming on board at the beginning of next week ... and their entire organization will be using Internet Explorer.

I need some way of quickly making the core features of my site IE compatible. I can pay a consulting company if that is necessary, but I don't know the first thing about making my site IE compatible - I don't know the IE development tools and I don't know the first thing as to why IE doesn't render things properly.

What's the best way to go about solving my problem? I don't even see a firebug / inspect element equivalent for IE. I only will worry about IE 9 for now - this company is on the latest IE for sure.

Let me know, I'm totally panicked!