Chicago--Briefing.com Inc., which provides live market analysis on the Internet, Monday announced plans to launch the most expensive advertising campaign in the company's history. "The current industry weakness provides Briefing.com with an excellent opportunity to expand market share,'' said Dick Green, president of Briefing.com, in a statement. The multimillion-dollar campaign, developed by Chicago ad agency Killian & Co., includes a TV spot on CNBC, as well as print and online ads. Briefing.com also announced content partnerships with Yahoo! Inc.'s MarketTracker, Prudential Securities Inc. and Morgan Stanley Dean Witter & Co.