function validateEmailForm() {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.emailList.emailAdd.value;
   if(reg.test(address) == false) {
      alert('Please enter a valid email address');
      document.emailList.emailAdd.value = "";
	  document.emailList.emailAdd.focus();
   } else {
      document.emailList.submit();
   }
}