<script type="text/javascript">
  $(document).ready(function(){
    $("#formulario").validate({
      errorClass: "req",
      errorLabelContainer: $(".req"),
      onkeyup: true,
      rules:
      {
        login:
        {
          required: true,
          remote:
          {
            url: "verifica.php",
            type: "post"
          }
        }
      },

      messages:
      {
        login:
        {
          required: 'Este campo é obrigatório',
          remote: 'Este login não existe'
        }
      },

          errorPlacement: function(error, element)
    {
      $(element).filter('#login').qtip({
        overwrite: false,
        content: error.html(),
        ignoreTitle: true,
        position:
        {
          corner:
          {
            target: 'topMiddle',
            tooltip: 'bottomMiddle'
          }
        },

        show:
        {
          when: { event: 'none' },
          ready: true
        },

        hide:
        {
          when: { event: 'keydown' }
        },

        style:
        {
          background: '#7c1623',
          border:
          {
            color: '#7c1623',
            radius: 5,
            width: 1
          },
          color: '#fff',
          name: 'red',
          padding: 5,
          tip: true
        }
      });
    }
    });
  });
</script>