Programming blog

This seems to do it:

 $('.navbarItem').hover(
 function () {
  // Mouse over, first hide any gradients that have not been hidden.
  $('.navbarItem').children(".gradient").hide();

  // Turn on the gradient for this item.
  $(this).gradient({ from: 'dddddd', to: 'aaaaaa' });
 },
 function () {
  // Mouse out (this doesn't always get called), hide the gradient.
  $('.navbarItem').children(".gradient").hide();
 }
 );