Intermittent Wireless Signal

We recently purchased a IMac Intel Core Duo. We have Comcast and installed a wireless router. Other PC's are wired to router and work great. Our IMac has very intermittent signal strength and hense, internet use. Typicall scenario is that you load 3 or 4 pages, works great, then signal drops and no more internet connectivity. We moved the IMac to within 3 feet of the wireless router to make sure it was not the distance, and get same result. We call Comcast, they say talk to Apple. We talk to Apple, they say it is Linksys. Talk to Linksys, and they say it is Apple.
Help!
Thanks
IMac Intel Core Duo   Mac OS X (10.4.6)  

The router is already configured to connect to the internet, because it is doing so for your PCs using ethernet, so don't mess with that part.
First you need to find the User Guide for your Linksys Router to learn how to turn on and configure the wireless ability of the router so it can connect to the Airport card in your iMac. If you can't find your Guide, go to the Linksys website and locate your router model and download a PDF version of the Guide.
If the PC version of the Linksys Setup Wizard is on one of your PCs you can use this and the Guide to configure the wireless part of the router. If you don't have the Wizard, find the chapter in the guide that describes how to access the router with a web browser and configure it that way.
After you have configured your router for wireless operation with one of the PCs, go to Mac Help located in the Help menu of the Finder on your iMac. Go to the Index and choose Airport. There you should find articles that instruct you on configuring your Network System Preferences to use the Airport Card in your iMac to connect to your wireless router.

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