Cell phone or digital cam as a webcam for a mac computer?

Is it possible to use a cell phone (sony ericsson w810i) or a digital camera (samsung L700) as a webcam for yahoo messenger on a mac? I have huge problems finding an affordable webcam for the mac, so I would appreciate any help you can give me.

I tried using macam, but it wont work.

You can use a digital camera if it has the video camera feature and its USB compatible. I would recommend you get a small tripod around $10. Your camera manual should give further instructions. Good luck...

Try macam:
http://webcam-osx.sourceforge.net/

Read the main page then download it.
It supports many types of webcam for PC. Just buy a common webcam and then install this software.

Good luck!