ASP.NET Photo Upload Javascript function

I NEED AN EXPERIENCED ASP.NET PROGRAMMER ASAP! I need a function, probably javascript implemented into an ASP.NET application I'm building. I'm sure this is easy but I don't know how to do it and I don't have time to find the solution. In this app, I build a photo album, each picture and a checkbox underneath it. There is a button called "accept all photo names" which basically needs to select every checkbox on the screen. The checkboxes are added dynamically at runtime. LOOK at page 5 of the handout I have attached. You can ignore the other pages if you'd like. This page details exactly what I need. Help me! The winning bidder needs to help me implement and understand the code. They will assist me until I have the application working.