AJAX content in a jQuery UI Tooltip Widget

Here is a ajax example of jqueryui tootip widget from my blog.hope it helps.

$(document).tooltip({
    items:'.tooltip',
    tooltipClass:'preview-tip',
    position: { my: "left+15 top", at: "right center" },
    content:function(callback) {
        $.get('preview.php', {
            id:id
        }, function(data) {
            callback(data); //**call the callback function to return the value**
        });
    },
});