Hyperlink appending/doubling to links

Hi,

I have had a site running with Webpress for four years now. Everything has worked fine.

Today I noticed that links are not working. My website’s url is appending to them. So, for example if a link was supposed to lead to “Amazon.com” it is now leading to “http://www.Mysite.com/http:www.Amazon.com.” Same goes for internal links. It now reads “http://www.Mysite.com/%E2%80%9Dhttp://www.Mysite.com/subpage.”

This has never happened before. Does anybody have any idea what could be causing the problem?