Dns server is adding extra domain

Added an internal web server and was accessing it fine with ip address in the browser, however, I wanted a friendly name, so I added the ip to an A record and even did a www. Cname. It works great, however,

When I am on the front page of the site, internal links ( /something) work fine. But (www.google.com) on the same front page of the internal website appear as http://www.mysite.com/www.google.com

I don't get it!
The a record and cname work and seem to be fine, but DNS is adding the domain to every link!

What can I do to fix this?

If you need any info let me know.