DoubleClick on the block?

Rumors are swirling that Net ad firm DoubleClick is on the block, with a $1.2 billion takeover bid on the table from San Francisco buyout firm Hellman & Friedman. Costs of the search are weighing heavily on the former Internet ad darling, too. The company reported a first quarter loss compared with a profit a year ago, based on costs from the acquisition search. Its shares have also bounced around, rising with the rumors then falling back post-earnings. Analysts downgraded DoubleClick