Just when you thought all the hot advertising spaces were being sold, Planet Internet, a Dutch portal, on Friday booked a campaign for Murphy's beer on its 404 Error pages.

When visitors to the Planet Internet site get a 404 Error, after typing in a wrong address or clicking on a dead-end link, they'll go to a page with a big red advertisement for Murphy's Irish beer. It promises them a free beer and a chance to win a trip to Ireland if they click.

The ad is part of the "Murphy's Law" campaign for Murphy Irish Red in the Netherlands. The campaign's tagline is, "Murphy's Irish Red -- it's not as tough as you think."

The campaign runs through the end of May. Murphy's is one of the three corporate brands from Dutch brewer Heineken NV.