(function ($) {
    $.fn.extend({
        highlight: function (strings) {

            function findText(node, string) {
                if (node.nodeType == 3)
                    return searchText(node, string);
                else if (node.nodeType == 1 && node.childNodes && !(/(script|style)/i.test(node.tagName))) {
                    for (var i = 0; i < node.childNodes.length; ++i) {
                        i += findText(node.childNodes[i], string);
                    }
                }
                return 0;

            }

            function searchText(node, string) {
                var position = node.data.toUpperCase().indexOf(string);
                if (position >= 0)
                    return highlight(node, position, string);
                else
                    return 0;
            }

            function highlight(node, position, string) {
                var spannode = document.createElement('span');
                spannode.className = 'highlight';
                var middlebit = node.splitText(position);
                var endbit = middlebit.splitText(string.length);
                var middleclone = middlebit.cloneNode(true);
                spannode.appendChild(middleclone);
                middlebit.parentNode.replaceChild(spannode, middlebit);
                return 1;
            }

            return this.each(function () {
                if (typeof strings == 'string')
                    findText(this, strings.toUpperCase());
                else
                    for (var i = 0; i < strings.length; ++i) findText(this, strings[i].toUpperCase());
            });
        }
    });
})(jQuery);

jQuery.fn.removeHighlight = function () {
    return this.find("span.highlight").each(function () {
        this.parentNode.firstChild.nodeName;
        with (this.parentNode) {
            replaceChild(this.firstChild, this);
            normalize();
        }
    }).end();
};