querystring using javascript

hi everyone
i ve a problem regarding querystrings which is as follows.

i m making a popup window and onclick of a href that window pops up and i m sending my querystring along with that.

now i want to use that query string in that popup page but i m unable to do that it is giving a 'object expected error'.

the code is as follows:

window.open("interfacepop.asp?hotelid="+window.document.form1.hotelid.value,"interface","scrollbars=1, menubar=0, toolbar=0, top=90, height=350, width=400");

the code that i m using in the pop up.
window.document.form1.action = "interfacepop.asp?submit=Y&hotelid="

But this not working, please anyone can help me ...

Thanks