jQuery.fn.highlight = function(pat) {
        function innerHighlight(node, pat) {
            var skip = 0;
            if (node.nodeType == 3) {
                var pos = node.data.toUpperCase().indexOf(pat);
                if (pos >= 0) {
                    var spannode = document.createElement('span');
                    spannode.className = 'highlight';
                    var middlebit = node.splitText(pos);
                    var endbit = middlebit.splitText(pat.length);
                    var middleclone = middlebit.cloneNode(true);
                    spannode.appendChild(middleclone);
                    middlebit.parentNode.replaceChild(spannode, middlebit);
                    skip = 1;
                }
            }
            else if (node.nodeType == 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
                for (var i = 0; i < node.childNodes.length; ++i) {
                    i += innerHighlight(node.childNodes[i], pat);
                }
            }
            return skip;
        }

        return this.each(function() {
            innerHighlight(this, pat.toUpperCase());
        });
    };

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