UK visitor Visa

[mumora]

Hi
I am of Indian origin and presently located in NY,USA.I have a L1 visa valid till March 2006.I applied for a Visitor visa to the UK online.My online application was sucessfull. The UK consulate has asked me to send some supporting documents in for issueing a visa.

One of the documents asked for is "If you are in the US - Valid US Immigration Status (originals not
copies) e.g. Permanent Residence Card (issued before 21 April 1998)
Advance Parole Document, Employment Authorisation Card etc"

what are the documents that i can furnish to them ?

thanks

[immihelp]

I-797 (Notice of Action) that proves your L1 visa status in US.