[plug] Squid add google search variable

[Patrick Tehvand]

Hi there guys,

I am having a mental blank, I would like to force all users who use  
google image search to append the variable &vss=safe to their requests.
I know this is possible using squid but all my google searches are  
not returning what I want.

Does anyone know off the top of their head how to do this or know the  
search terms I should be using?

Cheers
Patrick