The Midwest AIDS Prevention Project in Detroit launched a new multimedia advertising campaign Tuesday targeting young men who have sex with men that encourages them to practice safer sex and to be tested for HIV antibodies. The campaign, funded by the Centers for Disease Control and Prevention and crafted under the guidance of advertising firm Solomon Friedman Advertising, includes billboards, print advertisements, posters, and other promotional materials, including T-shirts, condoms, and specially printed phone cards. The ads will include such slogans as "Think you're invincible? I'm counting on it. Signed, AIDS" and "Your place or mine? Signed, AIDS." A telephone number for more information or to locate HIV testing centers also is provided. MAPP officials say the project was developed in response to data showing that HIV infections are increasing among young gay and bisexual men across the country.