Star Rating Function

We have implemented a star rating recently on a site and it looks good. My QA person (who has a very good eye) came with a concern he has with the functionality. The issue is that if he selects 5 stars but at a second thought if he needs to change it to 4 stars before submitting/saving this is not possible. I agreed with his concern and got a script in the next minute searching in .
Here is a wonderful script that can be changed again and again (any no of time) before you submit. It works just like how it works in
Happy RATING!
http://www.nickstakenburg.com/projects/starbox/
Now the Programming experts need to tell if this is hard to implement?
Here is a wonderful script that can be changed again and again (any no of time) before you submit. It works just like how it works in
Happy RATING!

http://www.nickstakenburg.com/projects/starbox/
Now the Programming experts need to tell if this is hard to implement?