Travel to mexico will make my H1B COS invalidate

I am currently on L1 visa with stamping and I-94 date till july 2013

And my employer also applied H1B with COS this year and it is still in Initial review state

I like to continue on L1 even after H1 approval.

Can i go to mexico while my H1B status is pending ? will that makes my H1B COS invalidate ?

Please let me know

Thanks in advance