var Email = document.emailSub.elements["email"];
Email.onfocus=function() {
    var fn = document.emailSub.elements["email"];
    if (fn.value=="Email Address") fn.value="";
};
Email.onblur=function() {
    var fn = document.emailSub.elements["email"];
    if (fn.value=="") fn.value="Email Address";
};