One thing to remember is if it works in Firefox, it works on every platform. Windows people can still use your site even if they need to click another icon fir

One thing to remember is if it works in Firefox, it works on every platform. Windows people can still use your site even if they need to click another icon first... IE-only means you lose all the Mac people, all the Linux people, and probably turn off the majority of the more clued-in Windows people. Early adopters -- your target audience I assume -- don't tend to use IE.