By Stephen M. Silverman
April 21, 2003 12:00 PM

Half-truths are said in jest, the old saying goes, which means that Ray Romano wasn’t completely joking Saturday when he was asked how he keeps his Nielsen Top 10 sitcom “Everybody Loves Raymond” fresh and original.

Replied the Emmy winner: “You stop after one more year.”

According to the Associated Press, the star, who was attending a Goo Goo Dolls and Bon Jovi concert in Las Vegas to benefit the Tiger Woods Foundation, indicated he wanted the CBS show to wind up on a high note.

“It’s hard work,” Romano said of the sitcom, which debuted in 1996. “You start repeating yourself … The trick is to get out when you’re still wanted. Not too soon, but not too late.”

In other TV news, the Los Angeles Times reports that “7th Heaven,” reputedly the WB’s highest-rated series for the last seven years, has just been renewed not only for an eighth season, but a ninth one as well. (The WB, like PEOPLE, is part of AOL Time Warner.)

The show, which deals with the domestic doings of Eric (Stephen Collins) and Annie (Catherine Hicks) Camden and their seven children, marks its 150th episode Monday night. Bo Derek and Phyllis Diller guest star.