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();
};