W3c css validator

I’d like to install the w3c validator so that I can add a link to my web pages that will take the visitor directly to the w3c css validation svc and automatically validate the page they were visiting.
I went to their download page:

and found a whole bunch of instructions. I don’t know if I have these prerequisites with Dreamhost. Can you help? Thanks!

never mind, I found out how to do it, just have to add a link with /check/referer after it, as in this page: