integral interpretation

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I found an integral which sage doesn't much seem to like:

var('R, t') integral(((1/(Rt))exp(iRt)), t) it returns this: (essentially) (Ei(iRt))/R

But the two i's should just multiply out and the two R's simplify to 1. And what's 'E'? I realize the integral is divergent, and the indefinite serves my purposes, but I'm not quite sure what

Also, if anyone could point me to a thread on how to attach those nifty screenshot-like html images of a sage session (like those used in error reports, i have no idea what the right word is) into a text box like this, that would be be appreciated. Still new to computing.