Share Internet Connection To USB Modem Via Router?

I have a CDMA compatible modem which connects to my Desktop PC via USB.it works fine, but I'd like to share my internet connection with another Laptop, Wirelessly via a Router. The router connects to my Pc via Lan cable. I activated Internet Connection Sharing in the properties of my modem and connected it to the Internet.I hoped my Router would detect an Internet connection on My network and would enable internet connectivity on My wireless AP on the Router. But it didnt. is that windows refelcts "internet access" on both the actual Wireless network on my Router ("49 network") , and on both the Physical Connection to my pc via the Ethernet port ("3G Router") my laptop connects to the router, but without access to the internet, and I keep getting an 'unable to resolve host' message in my Browser. Suspecting my Router of somehow causing the problem I also tried setting up an Ad hoc network instead (using my wlan card to interface with the Laptop directly). They connect fine, and my Printers and other shared resources all appear, but the wireless range between them is like bluetooth compared to the great range of my router.& I still cant manage to share an Internet connection between the two machines!