I have managed to get a example of Ajax up and working. http://www.ridedorx.com/test_site/form.html
It is nothing much but has every zip code in the US in it. Type in a zip and as soon as that element loses focus the city and state are populated from my database without the page reloading.
I am mainly looking to create a cascading drop down using Ajax. So the code for each menu is not pulled until needed by "onClick" or "onMouseover".