function validateUser()
{
     var username = $('Username').value;
     var password = $('Password').value;

     new Ajax.Request('http://www.jupiter.com/Global/HomePageAuth.php',
                              {
                                   parameters:'Username='+username+'&Password='+password,
                                   onSuccess:checkAuthResult
                              });
}

checkAuthResult = function (t)
{
      if(t.responseText != "Invalid")
      {
            window.location=t.responseText;
      }
      else
      {
            $('Username').value = "Login Failure";
            $('Password').value = "";
      }
}