So are you saying that electromagnetism is the same as gravity? Or that electromagnetism generates gravity?
In the first case, there are big differences between electromagnetism and gravity. (I think this thread covers these:
Why isn't it obvious that Gravity, Electro-Magnetism, and the Stronge Nuclear force)
In the second case, what's the mechanism whereby electromagnetism generates a gravitational field? And why isn't it reproducible in a lab (because it would be pretty obvious if it happened)?
Or have I got the wrong end of the stick and there's a third option?