Over three quarters of web users have stumbled across disturbing content on the net but have no idea how to report it, according to the Internet Watch Foundation (IWF).

With this in mind the IWF, which handled 34,781 reports of illegal content in 2007, is running a campaign featuring banner adverts, emails and web pages to raise awareness of how to report illegal content. To report any illegal content, net users simply click a red button on the IWF's website. They can also choose to report content anonymously or leave contact details if they want to be notified on the action taken.

"People might get unsolicited emails and not know where the link leads and could end up somewhere they did not want to be. The message is that it's important that they do report it to us," said Sarah Robertson, a spokeswoman for IWF.

However, Robertson also reminded users to leave chasing and shutting down sites hosting illegal content to the IWF.

"It's an offence to seek out this content to view it for any reason."

See also: New EU platform helps users report child porn