var bikky = document.cookie;

 function getCookie(name) { // use: getCookie("name");
   var index = bikky.indexOf(name + "=");
   if (index == -1) return null;
   index = bikky.indexOf("=", index) + 1;
   var endstr = bikky.indexOf(";", index);
   if (endstr == -1) endstr = bikky.length;
   return unescape(bikky.substring(index, endstr));
 }

 var today = new Date();
 var expiry = new Date(today.getTime() + 28 * 24 * 60 * 60 * 1000); // plus 28 days

 function setCookie(name, value) { // use: setCookie("name", value);
   if (value != null && value != "")
     document.cookie=name + "=" + escape(value) + "; expires=" + expiry.toGMTString();
   bikky = document.cookie; // update bikky
 }
 
 
 function set() {
	var userEmail = document.newsletter.email.value;
	setCookie("userEmail", userEmail);
 }