People Liking People Needs Help: cheap surveillance options?

Here's what we're wanting to do: set up a cheap home surveillance system. We'd like to have a webcam (just 1 is fine) that can connect to our router so it doesn't have to connect and be processed by our computer. It'll then be sent to a site that records all video from the camera. The reason we don't want it going through our computer is that we use it for many other things and a 24/7 stream being saved to the drive constantly would probably take up too many resources and slow us down. If there's any geeks out there, what's the best and cheapest way to do this? We'd like a decent quality, not the usual crappy webcam type. But it has to be really cheap (we're broke). Thanks in advance!