US online giant eBay and the renowned auction house Sothebys announced a partnership Monday for online sales of art and collectibles. The two firms said they would produce live auctions at Sothebys headquarters in New York and create a special Web portal that allows for real-time bidding from anywhere around the world. The companies will also explore themed and time-based sales, as well as live auctions from Sothebys other global salesrooms. The growth of the art market, new generation technology and our shared strengths make this the right time for this exciting new online opportunity, said Bruno Vinciguerra, Sothebys chief operating officer.