The National Theatre has postponed the opening of "Doublecross," a first play by Washington attorney Gary Bohlke. It was to follow "Les Miserables," which ended its run Oct. 13. The play was to have been produced by Kennedy Center founder Roger Stevens, who will instead bring in A.R. Gurney's hit play "Love Letters," which he produced on Broadway. It will open here next Wednesday. The two-character play will feature a rotating all-star cast, with Colleen Dewhurst and E.G. Marshall in the first two weeks of the six-week run here. Other actors have yet to be scheduled. In "Love Letters" the two actors, seated at a table, chronicle a lifelong relationship solely through their letters, which take the ill-fated romance from second grade into middle age.

"Love Letters" will be followed by what the National expects to be a big Christmas season draw, a show of "The Music of Andrew Lloyd Webber." In January, Neil Simon will bring his new Broadway-bound play, "Lost in Yonkers." Out and About For the third year in a row, Rep. Wayne Owens has held a "Mrs. Fields Cookie Day" for his colleagues in the House. Debbi and Randy Fields, creators of the popular cookie franchise, are from back home in Park City, Utah. The Democrat had planned to give cookies to all the members except House Minority Whip Newt Gingrich, but at the last minute, he decided that in the hope of getting Congress adjourned, even Gingrich would get his cookies. Edward Kennedy became the only senator to get a tin of cookies when he ran into an Owens intern delivering the chocolate chip delights in the Rayburn Building. Kennedy pointed out that since Owens is his former administrative assistant, he was due a tin of cookies. The intern didn't argue ...

Hospital Report: The seemingly indestructible singing cowboy star Roy Rogers is listed in good condition at St. Mary Desert Valley Hospital near his California home after undergoing surgery Monday to repair his aorta. The 78-year-old star of a popular television series and some 87 western movies, almost half with his wife, Dale Evans, was taken to the hospital Sunday after complaining of stomach pains. Rogers underwent open-heart surgery in 1978, and doctors had been monitoring an aneurysm in his aorta for several months ...

United Press International has created an award in honor of its most famous employee, Helen Thomas, the dean of White House correspondents. The Helen Thomas Unipresser Award, the first UPI journalism honor recognizing achievements of UPI journalists, includes a cash prize of $1,500 and will be awarded annually beginning in 1991 ...

Bob Hope is going to take his Christmas show to the troops in Saudi Arabia, but this time it will be different. Hope has for decades brought starlets and beauty queens on his entertainment tour of troops around the world, but this time they will be left behind to avoid offending the sensibilities of the conservative Saudis. The 87-year-old Hope said, "How am I going to go without the girls? I'd hate to think I was the only pretty face there" ...

Manuel Noriega, whose name has disappeared from the news, apparently isn't exactly suffering during his incarceration at Miami's Metropolitan Correction Center. According to the San Francisco Chronicle, his "cell" includes a bedroom, a conference room, an office, a color television, a computer, an exercise bike, a paper shredder and two safes. And we don't like him very much ...