how to close back button

[kuzukuzu]

hej

when u go to http://rapidshare.com/#!download|0l32|0|-|0

and u click on back, you cant, they coded it like that so u stay on the page

with what code can i do it same for my site?

 

[__Doc_]

can you provide a real link, I wasn't aware this still worked on Firefox. used to work on IE and Safari
The easiest would be to open a new window without a toolbar, but I'd like to see the back button disabled