Javascript Auto Accept Custom Prices

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Job Description

Looking for development of a extension for Magento Community 1.7 I want my customers to be able to input their price own price that will be either rejected or accepted. When they put their price in I want a javascript popup to open and say "submitting offer" with some images.... Then I want to either to automatically deny or accept the offer. From that the customer will be able to checkout with the price that is accepted.

From the backend I must be able to set a start and end date, quantity, set the lowest price I am willing to sell the product for.