World Wrestling Federation Entertainment Inc. agreed to buy AOL Time Warner Inc.'s rival World Championship Wrestling brand, putting the two biggest U.S. professional wrestling leagues under one roof. Terms weren't disclosed. The agreement calls for WWF to gain the worldwide rights to the World Championship Wrestling name, video library and other intellectual property, the company said in a statement. WWF also gets rights to WCW wrestlers, whose names have included Hulk Hogan, who started out on WWF in the 1980s. World Wrestling Federation wants to use the WCW brand to build interest in both leagues through cross-promotions and stunts such as pay-per-view television matches pitting popular WWF wrestlers against those of the WCW. ``WWF now has a virtual monopoly on (professional) domestic wrestling,'' said Breck Wheeler, an analyst at Legg Mason Wood Walker Inc. who rates WWF shares a ``market perform.'' Money-losing WCW has been plagued by low ratings in recent years, in part because of competition from WWF, whose wrestlers include ``The Rock.'' WCW lost about $80 million last year, according to an estimate from Merrill Lynch & Co. analyst Jessica Reif Cohen. WCW programming, which is being dropped by AOL Time Warner's TBS and TNT cable-TV channels this month, is expected to run on Viacom Inc.'s TNN cable network ``in the near future,'' WWF said. Viacom already shows WWF wrestling and football on its UPN and TNN networks. Cross-Promotions Stamford, Connecticut-based WWF said today that it may start promoting the two leagues as early as Monday during the ``WWF Raw Is War'' program on TNN and on the final performance of ``WCW Monday Nitro Live'' on TNT. ``This acquisition is the perfect creative and business catalyst for our company, WWF Chief Executive Linda McMahon said in a statement. The purchase comes as WWF works to prove to Wall Street that it can expand beyond its trademark WWF wrestling, whose television ratings have declined in recent months. WWF also is struggling with the XFL, a startup football league co-owned by General Electric Co.'s NBC network. NBC's broadcast of the XFL on Saturday got the lowest audience rating ever for a sports event shown on network TV during prime time. ``There still remains a cloud over WWF related to the XFL and how much money it will ultimately lose this year and how much more money they will ultimately commit to it,'' Wheeler said. WWF shares today fell 1 cent to $12.10. The stock has fallen 24 percent in the past year. AOL Time Warner rose $2.75 to $39.52. Failed Agreement In January, closely held Fusient Media Ventures said it would buy WCW for an undisclosed price. That agreement collapsed after Fusient decided that the money-losing WCW would be too much of a financial burden, Broadcasting & Cable magazine reported earlier this month. WWF came close to buying WCW last year, McMahon said in a December interview. It didn't make a bid, though, because WWF needed approval from partner Viacom, making a transaction ``financially impractical'' at the time, McMahon said. Viacom and General Electric each own about 14 percent of WWF, according to federal filings.