This is a tricky one

I have an alltel usb internet connection that obviously plugs into the usb on my comp for my brodband internet. I also have a linksys wireless G router. I need to know if there is any way to send my internet signal through my network adaptor (on comp) to the wireless router so I can have a wireless network? I cant figure this out or find a product that I can plug this usb internet device into to brodcast my internet.

You will need to get the manual and see if it supports being a bridge or just a wireless client.
Alternatively, have you tried connecting your PC to the router and diabling the router functions (assuming you dont need them) then sharing your internet connection on the PC?

CP