Custom programming

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Need a little custom programming for an online fabric shop. Specifically, I need someone who can create a custom inventory field that allows customers to select incremental quantities while pulling from the same inventory number. For example, when someone types 4.25 in the quantity box, it will automatically translate that to the appropriate number of .25 yard increments so shoppers have an intuitive way to input yardage appropriately.  This can be accomplished through Javascript and Ajax api.

Email jess{at} if you can do this. Please provide your rate, as well. Many thanks!