Url problem

Hi,

I am getting a problem

i have a website url like http://www.mysite.com but one one my internal folder is displayed like this http://mysite.com/folder whenever i click some anchor text from my backlinkings or links pointing to that folder url, ... I want it to come like http://www.mysite.com/folder. [for live example please check first anchor text of my signature] [p.s: I am not advertising ].

help