function validate()
{
  with(document.login)
  {    
    if (email.value.length ==0 || 
        email.value.indexOf("@",0) < 0 || 
        email.value.indexOf(".",0) < 0) 
    {
      alert("Please enter a valid e-mail address!");
      email.focus();
      email.select();
      return false;
    }
  }
 return true;
}