Javascript In Squarespace Isn't Working?

I have a custom form that uses javascript that I'd like to add to my site. What the form does, is in stead of having a text label it has an image label which will change when a use

Solution 1:

You need to include jquery since you are using jquery functions. Add this snippet before the rest of your javascript. Preferably in the head section

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>