application for facebook business pages/tab - maximum width for embed

I am looking at creating an application for facebook business pages (e.g. restaurants).

There will be a sign-up page (to identify th business as having access to our system and to pull the appropriate content, and then, based on that, we will be displaying content under a new tab.

To determine feasibility I need to know the maximum width allowed for the iframe in which we can display the information (not critical for sign-up process). I noticed that the page layout varies under different facebook tabs. Can one choose that when int开发者_如何学编程egrating the iframe?

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The width of the FBML page has to be 520px so aslong as it fits within your design the it will work.

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