USB to Ehternet?

Hi, can anyone tell me if it is possible to convert a USB output ADSL modem (speedtouch 330 male plug) to an ethernet input.
I have the speedtouch modem that I want to plug into a Linksys WRT54G.
I can find female ethernet to male usb but not the other way around.
Any suggestions on this would be a great help!
Thanks

hmm, Ive never seen any one try that before, but maybe something like this:http://www.compusa.com/products/product_info.asp?product_code=298426&pfp=srch1
that one might even work. usually when something at compusa says its pc only, it works with mac too.

That is an ethernet to USB adapter. He needs the otherway around which I am almost positive does not exist