I have already written script for disabling the signature field until 5 other fields have been completed. But I don't know how to do that with 5 buttons I have.

This is my current script:

if(event.value != ""
&& this.getField("Name").value != ""
&& this.getField("Phone Number").value != ""
&& this.getField("Email Address").value != ""
&& this.getField("Directorate").value != "Select from Dropdown") {
this.getField("User's Signature").readonly = false;
} else {
this.getField(User's Signature").readonly = true;
}