Can H1b activation done by different employer

Hi,

I currently have L2 EAD valid till Jan ,2013.

My previous employer has filed h1b and its in processing.

I have resigned my job with the previous employer and working for another employer now.

When I receive my h1b , is it possible to activate the same with my current employer as I have never worked for the previous employer in H1 visa?

Thanks
Swetha