Connect your dsl modem to a wireless router

First make adsl modem to dial (ppoe) i hope you know how to do that, if not i'll explain that later...enable dhcp in the adsl modem(i think its enabled by default, just cross-check)...
Then connect your linksys router to any pc to configure it, go to the login page(192.168.1.1 or 192.168.0.1 depending on your router) type user name and password(i think its admin/admin or admin/password or admin/(blank)).. there make sure you disable dhcp and set to bridged mode(not dialed mode cause adsl modem is doing the dialing)...Thats it for the configuration..
Then connect your adsl modem to the first LAN port of the linksys router..make sure you connect it to the LAN port and not the WAN port.. the WAN port will be seperated from the LAN ports, so you should be able to make out the difference..Then connect other pcs to the other LAN ports of your linksys router...
THe wireless configuration is standard, just like any other router.. set the SSID and better set a good WEP key.. and choose a channel like 6 or 11.. and you should be good to go!!All the best!!!!