Online advertising company DoubleClick now has Google among its suitors. The price tag could pass two billion dollars as Google competes with Microsoft, Yahoo, and possibly AOL for the company. DoubleClick’s owners, a private equity firm called Hellman & Friedman, bought DoubleClick for one point one billion in late 2005.

DoubleClick’s network contains hundreds of websites, carrying advertising sold by other agencies to display it to Internet visitors. The Wall Street Journal said AOL wants to protect its relationship with DoubleClick, while the higher price tag could turn off Microsoft’s interest in acquiring the ad network.