H1b / OPT Extension validity

[queryforh1]

Hi, i was on F1 before and in october 2008 i received i 797 approval for h1b.

Now on F1, student visa i received opt extension which is valid till August 2009.
But i already received I 797 approval in October 2008 so i am on H1-b.

Q1- So my question is can i still work under OPT's EAD card till august 2009?

Q2- If i work for different employers using OPT card till august 2009 will i violate any rules or my h1-b?

Q3- If i work for different employer using OPT CARD and after august 2009 i will work for my employer only , can this be possible and valid?


thanks a lot gurus