Nested Radio Buttons

I would like to add a feature to my website that allows me to easily categorize. This will be designed through nested radio buttons. When a person first gets to the website, they will see larger categories only. For instance they will see, Insects, Fish and Birds. Each of these will have a radio button next to it. When one of the radio buttons is pressed, a selection of subcategories with radio buttons slides out from under the first category. For instance, if a person chooses birds, then three options will slide out from under birds with the options to choose chicken, blue jay, and wood pecker. Each of these will have a radio button next to it as well and can be used to choose one of the birds. However, if a person has already chosen birds but then decides that they actually want to choose fish, then the person clicks the radio button next to fish. Then the sub-categories under birds disappear and the sub-categories marlin, sail fish, and shark slide out from underneath the category fish. When a subcategory slides out, it moves down the categories below it. In total it will probably have about ten categories and I would like to be able to have a different programmer who we are already working with update it. Please Dont Bid too Much or Outrageous and Bid Accordingly Thanks!