The purge is the main reason Yahoo's third-quarter profit more than tripled from last year to soar past analysts' relatively low expectations for the troubled Internet company. But the results released Tuesday also showed Yahoo's revenue fell by at least 12 percent for the third consecutive quarter. The revenue rut means Yahoo still has a long way to go on its comeback trail. Analysts, though, believe Yahoo should be able to boost its ad sales ¿ the main source of its revenue ¿ as long as the U.S. economy continues to heal and marketers funnel more of their budgets to the Web. ___ Sun Microsystems slashing up to 3,000 jobs SAN FRANCISCO (AP) ¿ Sun Microsystems Inc. plans to eliminate up to 3,000 jobs as it awaits a takeover by Oracle Corp., a deal that is being held up by antitrust regulators in Europe. The layoffs Sun outlined Tuesday in a regulatory filing amount to about to 10 percent of the company's 29,000 workers and will happen over the next year.