In her new book on former first lady Nancy Reagan, celebrity biographer Kitty Kelley charged that Mrs. Reagan had an affair in the White House with Frank Sinatra.

What do you think? Do you think Mrs. Reagan had an affair with Frank Sinatra? Or do you think the author was just repeating idle gossip?

To register your opinion, call SUNDIAL, the Baltimore Sun's directory of telephone information services at 783-1800 (or 268-7736 in Anne Arundel County) today until midnight.

After you hear the greeting, you'll be asked to punch in a four-digit code on your touch-tone phone. Enter 4600 and you'll be connected with "It's Your Call," The Evening Sun's survey on topical issues.

"It's Your Call" represents a sampling of opinions from certain segments of the community, but it is not balanced demographically as would be done in a scientific public opinion poll.

Look for results in Friday's Evening Sun.