[PHP] Multiple Entry SELECT and JavaScript interaction

I have a curious problem that I don't have a clue how to solve that's probably simple but I can't find it documented anywhere. It might be the first PHP-induced limitation I've run into... In order to allow multiple entry on a SELECT form object, the name of the form has to end with the brackets

[PHP] RE :[PHP] Multiple Entry SELECT and JavaScript interaction

In order to allow multiple entry on a SELECT form object, the name of the form has to end with the brackets [], but then when I do that I can't refer to it from within JavaScript because as a variable name it becomes illegal. I have to be able to refer to the SELECT object to change its contents