Date List WP-Ecommerce

Hi

I need to add an option in WP-Ecommerce on the single product page which displays the date 3 weeks in advance from the day the product is viewed as a drop down list.

The reason is to allow the user to choose a delivery date, and this needs to be up to 3 weeks in advance. However, we need to exclude Saturday and Sunday from the list.

For example, if the user orders a bed today – 04 April 2011, in a drop down list, the dates, starting from tomorrow – 05 April 2011, excluding saturday and sunday, would be available to choose from the drop down list up to 3 weeks away.

Any help appreciated.

Thanks
Andrew