Set radio button to no initial value

Version 4
    Add the below code to a custom HTML block, update the name in bold  to the name of the field.


    Replace the **** with the word "script"


    <**** type="text/javascript">




    Please ensure that you have access to an experienced JavaScript developer.

    Marketo Technical Support is not set up to assist with troubleshooting JavaScript.



    Here's a sample page: