Jupitermedia, parent to online advertising trade site ClickZ, announced it is purchasing stock photography firm Creatas for $38.2 million in cash and 1.5 million shares of its own stock (valued this morning at about an additional $27 million). Chief Alan Meckler said that, after adding this company to its other stock photography assets, this will make Jupitermedia the third largest company in the world in that market. The deal is slated to close in March.