While the Dolphins continued to work Tuesday on a trade for quarterback Joey Harrington, the team started to make backup plans by showing interest in former Rams quarterback Jamie Martin. The Dolphins have agreed to the framework of a two-year contract with Harrington but are having trouble meeting the Lions' asking price in a trade. According to a source, the Lions want the Dolphins' third- or fourth-round pick in the April 29 draft. The Dolphins have resisted because they have previously traded away their second-, fifth- and sixth- round picks.