I am MS Graduate.I am on OPT extension its valid till 03-15-2011 and i have valid f1 visa.
I am currently working as a full time employee Programmer analyst in e-verified company.

My employer applied my H1B on 4-4-2010. it is still in pending.my question is

I have to visit India for 20 days( father not feeling well) planing to leave may last week or June 1st week.

Can i travel India during the H1B processing time.?

If i go what will be the problem to my H1B? can i re-enter USA on my F1 visa without any issues in port of entry?.

or can I travel after my acceptance of H1B. in that case while coming should i need H1B visa stamping or can i re-enter on f1 only?

What documents should i carry in both situations(processing time and after acceptance of H1B). Please help.