Thanks for the advice, I was missing a call to JQuery. Even with the JQuery.js in place in the program and the call to it in the header:
I still have the same result of script being totally ignored when I load the browser page. I tried moving the script around, out of the header, into the body before the form, after the form, and no matter what I do it's as if the code is totally invisible. I feel like there must be something simple I'm missing.
The above line should call the disableRoles function, which never gets called. I stuck an alert(i); as a line in there in the hopes that it would pop-up with the selected index of the choice from the first dropdown as a way for me to see that the function is actually being called, and I never saw this alert.
As a test to ensure java was wasnt being blocked by my browsers (Firefox and Chrome) I tried this, which works fine, and produces the pop-up alert: