$(document).ready(function() {
  setTimeout(function(){ // after 20 seconds on site
    $(document).mousemove(function(e) {
      if (e.pageY <= 5) {
        // Launch MODAL BOX
        $('#exit_content').modal({onOpen: modalOpen, onClose: simplemodal_close});
      }
    });
  }, 20000);
});

function modalOpen (dialog) {
  dialog.overlay.fadeIn('fast', function () {
    dialog.container.fadeIn('fast', function () {
      dialog.data.hide().slideDown('fast');
    });
  });
}

function simplemodal_close (dialog) {
  dialog.data.fadeOut('fast', function () {
    dialog.container.hide('fast', function () {
      dialog.overlay.slideUp('fast', function () {
        $.modal.close();
      });
    });
  });
}