customize popover template for twitter bootstrap

popover_bootstrap.js

$('#field1').popover({
  title: '',
  content: 'That looks like an invalid location',
  trigger: 'focus',
  placement: 'top',
  template: '<div class="popover alert-error"><div class="arrow"></div><div class="popover-inner"><div class="popover-content"><p></p></div></div></div>'
});