you apply a CSS class to it then reference it in the CSS / Javascript page.

Say, I add the CSS Classname NoLooksies to a field i want hidden, I then need to add the following to the CSS:

.NoLooksies {
    display:none;
}

You can also just directly apply this CSS to the field, by using the field number. If the field is Field 4, then it would be like this:

#q4 {
   display:none;
}

The disadvantage of that is that it would need to be set up for each field you want hidden, but applying the same CSS class to multiple fields will make the first CSS suggestion apply to all the fields with that class

How do you set the value of a text box and variable using javascript please?