function validate(form) {
  var errmsg = "";

  if(!form.emailAddress.value.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\.biz)|(\.info)|(\.eu)|(\..{2,2}))$)\b/gi))
  {
    if(!errmsg)
      form.emailAddress.focus();
    errmsg += "a valid email address";
  }

  if(errmsg.length)
  {
    errmsg = "Please enter " + errmsg;
    alert(errmsg);
    return false;
  }
}