This link displays a tooltip on hover and gives its inner div the focus.
Here is what I did:
$(document).ready(function() {
$("#linkone").cluetip('this is the text for the cluetip', {
sticky: true,
onShow: function(c,ci) {
ci.attr('tabIndex', 1);
c.find('#cluetip-close a').attr('tabIndex', 2);
ci.focus();
}
});
});