Taco Bell Drops Longtime Ad Agency: The Irvine-based Mexican-style fast-food chain has ended its six-year relationship with Chicago-based Foote Cone & Belding, which developed youth-oriented advertising and the "Run for the Border" campaign. Taco Bell Corp., a unit of PepsiCo, will divide its $150-million annual advertising outlay between Dallas-based Richards Group and the New York and Orange County offices of Bozell Jacobs Kenyan & Eckard. "What you'll see is a sort of . . . refocus on value," a Taco Bell marketing executive said. Bozell Jacobs has done work for Pizza Hut--also a PepsiCo subsidiary--and handles the account for Taco Bell's Hot 'n Now drive-through hamburger chain.