http://joaobiehl.net/wp-content/plugins/humansnotbots/humansnotbots.js

1function HumansNotBots(replacement_method, strAT, strDOT) {
2    if (document.getElementsByTagName) {
3	if (strAT == null || strDOT == null) {
4	    strAT = "AT";
5	    strDOT = "DOT";
6	}
7	var disguisedForm = "([a-zA-Z0-9._%+-]+)\\s" + strAT + "\\s([a-zA-Z0-9.-]+)\\s" + strDOT + "\\s(co\.uk|[a-zA-Z]{2,4})";
8	var htmlbody = document.getElementsByTagName('body')[0];
9	if (replacement_method == 'innerhtml')   
10	    HumansNotBots_innerhtml(htmlbody, disguisedForm);
11	else if (replacement_method == 'dom')
12	    HumansNotBots_dom(htmlbody, disguisedForm);
13    }
14}
15
16/* innerHTML replacement method */
17function HumansNotBots_innerhtml(htmlbody, disguisedForm) {
18    var matchexp = new RegExp(disguisedForm, "g");
19    var replacement = '<a href="mailto:$1@$2.$3">$1@$2.$3</a>';
20    var newInnerHTML = htmlbody.innerHTML.replace(matchexp, replacement);
21    htmlbody.innerHTML = newInnerHTML;
22}
23
24/* Walk the DOM replacement method */
25function HumansNotBots_dom(element, disguisedForm) {
26    if (element) {
27	if (element.hasChildNodes()) {
28	    var child = element.firstChild;
29	    while (child) {
30		HumansNotBots_dom(child, disguisedForm);
31		child = child.nextSibling;
32	    }
33	}
34	else if (element.nodeValue) {
35	    var matchexp = new RegExp(disguisedForm, "g");
36	    var disguisedEmailAddresses = element.nodeValue.match(matchexp);
37	    if (disguisedEmailAddresses !== null) {
38		var unprocessedText = element.nodeValue;
39		var newParentsChildren = new Array();
40		for (var i = 0; i < disguisedEmailAddresses.length; i++) {
41		    var disguisedEmailAddress = disguisedEmailAddresses[i];
42
43		    /* textBefore is the text in unprocessedText that comes before the first disguised email address in unprocessedText */ 
44		    var textBefore = unprocessedText.substring(0,unprocessedText.search(new RegExp(disguisedEmailAddress)));
45		    if (textBefore) {
46			newParentsChildren.push(document.createTextNode(textBefore));
47		    }
48		    var matchexp1 = new RegExp(disguisedForm);
49		    var realEmailAddress = disguisedEmailAddress.replace(matchexp1, '$1@$2.$3');
50		    var a = document.createElement('a');
51		    a.setAttribute('href', 'mailto:' + realEmailAddress);
52		    a.appendChild(document.createTextNode(realEmailAddress));
53
54		    newParentsChildren.push(a);
55		    
56		    unprocessedText = unprocessedText.substring(textBefore.length + disguisedEmailAddress.length);
57		}
58		
59		if (unprocessedText) {
60		    // there is some text after the last disguised email address
61		    newParentsChildren.push(document.createTextNode(unprocessedText));
62		}
63
64		/* replace element with newParentsChildren */
65		var parent = element.parentNode;
66		var child = newParentsChildren.shift();
67		while (child) {
68		    parent.insertBefore(child, element);
69		    child = newParentsChildren.shift();
70		}
71		parent.removeChild(element);
72	    }
73	}
74    }
75}
76