jQuery.extend({highlight:function (node, re, nodeName, className) {
	if (node.nodeType === 3) {
		var match = node.data.match(re);
		if (match) {
			var highlight = document.createElement(nodeName || "span");
			highlight.className = className || "highlight";
			var wordNode = node.splitText(match.index);
			wordNode.splitText(match[0].length);
			var wordClone = wordNode.cloneNode(true);
			highlight.appendChild(wordClone);
			wordNode.parentNode.replaceChild(highlight, wordNode);
			return 1;
		}
	} else {
		if ((node.nodeType === 1 && node.childNodes) && !/(script|style)/i.test(node.tagName) && !(node.tagName === nodeName.toUpperCase() && node.className === className)) {
			for (var i = 0; i < node.childNodes.length; i++) {
				i += jQuery.highlight(node.childNodes[i], re, nodeName, className);
			}
		}
	}
	return 0;
}});
jQuery.fn.unhighlight = function (options) {
	var settings = {className:"highlight", element:"span"};
	jQuery.extend(settings, options);
	return this.find(settings.element + "." + settings.className).each(function () {
		var parent = this.parentNode;
		parent.replaceChild(this.firstChild, this);
		parent.normalize();
	}).end();
};
jQuery.fn.highlight = function (words, options) {
	var settings = {className:"highlight", element:"span", caseSensitive:false, wordsOnly:false};
	jQuery.extend(settings, options);
	if (words.constructor === String) {
		words = [words];
	}
	words = jQuery.grep(words, function (word, i) {
		return word != "";
	});
	if (words.length == 0) {
		return this;
	}
	var flag = settings.caseSensitive ? "" : "i";
	var pattern = "(" + words.join("|") + ")";
	if (settings.wordsOnly) {
		pattern = "\\b" + pattern + "\\b";
	}
	var re = new RegExp(pattern, flag);
	return this.each(function () {
		jQuery.highlight(this, re, settings.element, settings.className);
	});
};