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() {
    function newNormalize(node) {
        for (var i = 0, children = node.childNodes, nodeCount = children.length; i < nodeCount; i++) {
            var child = children[i];
            if (child.nodeType == 1) {
                newNormalize(child);
                continue;
            }
            if (child.nodeType != 3) {
                continue;
            }
            var next = child.nextSibling;
            if (next == null || next.nodeType != 3) {
                continue;
            }
            var combined_text = child.nodeValue + next.nodeValue;
            new_node = node.ownerDocument.createTextNode(combined_text);
            node.insertBefore(new_node, child);
            node.removeChild(child);
            node.removeChild(next);
            i--;
            nodeCount--;
        }
    }

    return this.find("span.highlight").each(function() {
        var thisParent = this.parentNode;
        thisParent.replaceChild(this.firstChild, this);
        newNormalize(thisParent);
    }).end();
};