function aali_login_validateLogin() {

   var isOk;
   var value;

   isOk = true;
   if (isOk) {
      value = document.aali_login_form.username.value;
      value = value.replace(/^\s+/,'').replace(/\s+$/,'');
      isOk = (value.length > 0);
      if (!isOk) {
         alert("Please enter a username.");
      }
   }
   if (!isOk) {
      document.aali_login_form.username.focus();
      return(isOk);
   }
   if (isOk) {
      value = document.aali_login_form.password.value;
      value = value.replace(/^\s+/,'').replace(/\s+$/,'');
      isOk = (value.length > 0);
      if (!isOk) {
         alert("Please enter a password.");
      }
   }
   if (!isOk) {
      document.aali_login_form.password.focus();
      return(isOk);
   }
   return(isOk);
}