How to setup 4 webcams to a PC & more

I am trying to install 4 video cameras, possibly webcam, as security cameras around a building.

I have to connect all 4 of them to one PC and be able to record video from all 4 of them when the building is not occupied.

I also have to make sure that I can look at live video from a remote location using high speed internet.

The building and my home have dynamic IP DSL connections.

Is this possible?
What are the equipments that you would recommend?

Thanks,

IP