I haven't faced it. But if you have, this discussion at Pharyngula would fill you in. I use NoScript plugin for Firefox and usually swat all scripts without mercy.
More like this
“Observing quasars is like observing the exhaust fumes of a car from a great distance and then trying to figure out what is going on under the hood.” -Carole Mundell
I can also recommend noscript. A little work tweaking it at start to accept the good pages and you're set for life. Malicious scripts might as well not exist.