I visited the site and tried a few links, couldn't reproduce the problem - do you have settings, site settings, Javascript allowed?
If so - and it's just that site - I have aggressive ad blocking via root, so I'd assume that some ad with Javascript is acting up.
I don't know of a way to just suppress the annoying message.
If you're interested, you could experiment, try Firefox, Menu, tools, add-ons, search - get the adblock plus addon and try the site from there.