Need some help with my ASP database

I've been asking the guy who designed my ASP database to help me add a function to it but he is too busy.

At the moment I add products and when they are out of stock they just say unavailable but still show up on the list. I want to retain the product details because I want to use them for an ID guide sometime in the future. However, I want a link for customers to press so they can show "in stock" items only, so there should just be a line of code behind it I assume saying display only items with quantity greater than zero. I also would like a link which customers can click to show items added in the recent period (probably 4 weeks), so returning customers can easily check what's new. I assume I would have to have some sort of calendar tied in with the database where I enter my new stock items and then this function would just pull out records entered after a certain date.

Is anyone here capable of helping me with this, it has to be done and I am not looking for a freebie. If you can help please pm me and let me know what sort of money you'd want for the work involved.

Thanks.