Identify the clause

I cannot find out the main clause of this sentence. What is the function of "So". Is it used as conjunction or adverb?

So, if you type in “Madonna” at the Google Video site and the results

are accompanied by ads, Warner wants a share of those ad dollars as

well as payment for any Madonna videos that are streamed or sold.

Is it the correct answer.

So, (if you type in “Madonna” at the Google Video site) and (the results

Adverb, (Adverb clause ) and ( noun clause)

are accompanied by ads), Warner wants a share of those ad dollars as

main clause

well as payment for any Madonna videos (that are streamed or sold).

(relative clause )

Thanks for help