auction

I need a website which will be used for auction. It should take all 4 types of bidding( English, Dutch, First sealed and Second sealed bidding). The seller will rigster with the site and post an item for bidding and he will select which type of bidding he wants. The buyer also a rigestered user bids for the item based on the type of bidding. Here the buyer can also post an ad like specifying his requirements and seller will send the prices( here its reverse of bidding and all 4 type of bidding should be implemented for this too). The evaluation of bidding will be done by automatic agents(a small program which should run at end of the day and evaluates who is the winner) and it should inform the seller and buyer that they are the winners.