Clarification About I-140 ( H1B Approved)

[ish1979]

Hi,

I have one question about my H1B/I-140 Approval.

My H1B is approved in the current Year (2009). Actually, I am in US from last one year on L1 and client/company filed my H1B ( Status Change) and I have got the approval notice ( I-797 A) from Immigration depart as approval of my H1B.

Now I have question that

Can I change a company here after starting with the company who filed my H1b ? or there are some different process/formality for that.

Can some one explain me the process of that ?

Thanks In Advance.

Ishwar