Set Cookie For Radio Buttons / Checkbox And Dropdown List Value

I'm trying to set the values of Radio buttons, check boxes and drop down lists so my users can go back and edit the form for a certain amount of time. So far it only saves text box values. I tried to implement the radio buttons in there but it doesn't work. What do I need to do so that radio buttons, checkboxes and dropdown list values are all saved?

Javascript:
<script>
/**
* Set a cookie
* @param string cookie name
* @param string cookie value
* @param string cookie expiration counter in days
* @param string cookie path
* @param string cookie domain
* @param bool secure?*/
function setCookie( name, value, expires, path, domain, secure ) {
var today = new Date();
today.setTime( today.getTime() );
if ( expires ) {
expires = expires * 5 * 60; .....