I have a scenario here.
I am currently on H1-B with employer A, and the I-797A is valid until 03/05/2013.
Now with the same employer I got an extension approval on I-797A starting from 03/06/2013 to 03/05/2016.
If I switch the employer now (or before 03/06/2013), will the new extension approval and the validity date change? how is this determined. Is there any chance of rejection?