Internet address

Savvy Internet users know that downloading unsolicited computer programs is one of the most dangerous things you can do online. It puts you at great risk for a virus or another time bomb from a hacker.

But even some sophisticated surfers could get taken in by a sneaky new attack in which criminals create fake YouTube pages -- dead-on replicas of the real site -- to push their malicious software and make it look like it's safe stuff coming from a trusted source.

You've been browsing the Internet lately for information about carbon emissions to help your daughter with her climate change project at school.

You've also done a little shopping in advance of the holidays, buying that more-than-you-really-wanted-to-pay-for digital camera for your spouse.

Now, instead of that usual Staples banner ad on the online site of your local newspaper, you are getting ads about hybrid cars and high-definition TVs.