Get Rid of merchant:Dixons in title bar

Hi all, I saw a solution to this before I disappeared offline for two months.

But I now cant find it.

Basically when merchant/category link is clicked on index.php

The title bar of I.E and Firefox show: merchant:Dixons or category:comedy

I would like to get rid of the "merchant:" bit or even add "You are Browsing" Dixons

I did get rid of this problem on the search box but I'm not sure where to change the info for the above.