Leading stocks showed mixed action during the past week, with some staging breakouts but others struggling. Questcor Pharmaceuticals (QCOR) jumped past a 46.94 buy point from a cup-without-handle base in strong turnover. Questcor got a lift from an upbeat note from Ladenburg Thalman analysts, who raised their price target for the stock. Another highly rated drug maker, Perrigo (PRGO), topped an 18.70 buy point from a flat base. Mellanox