function checkform ( form1 )
{

  if (form1.username.value == "") {
    alert( "Please enter your username." );
    form1.username.focus();
    return false ;
  }

  if (form1.password.value == "") {
    alert( "Please enter your password." );
    form1.password.focus();
    return false ;
  }

  return true;
}

function checkform2 ( form2 )
{

  if (form2.username.value == "") {
    alert( "Please choose a username." );
    form2.username.focus();
    return false ;
  }

  if (form2.password.value == "") {
    alert( "Please choose a password." );
    form2.password.focus();
    return false ;
  }

  if (! isValidEmail(form2.email.value)) {
     alert("Please enter a valid email address");
     form2.email.focus();
     return false;
  }

  if (!form2.terms.checked) {
    alert ( "You must agree to our terms & conditions in order to sign up.");
    form2.terms.focus();
    return false;
  }

  return true;
}