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Sorry - same answer - works fine in FF 3.6.6 here
Using Windows 7 Pro 64bit

I'm not seeing that here with FF 3.6
I can click anywhere within the 'hot' area of each button and it works perfectly.
Same with Chrome, Opera and Safari.

Can you post a sample of what you have done?
Using Xara's own tools I've not come across anything which isn't compatible with all browsers.
I'd imagine the developers would also like to know more...

Good luck. Remember, no hyphen in <iframe>

You could always have an iframe in the initial popup which opens another page in your design. This page can have multi-layers each with photo and a button which when clicked shows the next...