Code 1 :

<html>
<head> 

<script language="javascript" type="text/javascript">
	function emailCloak() {
		if (document.getElementById) {
			var alltags = document.all? document.all : document.getElementsByTagName("*");
			for (i=0; i < alltags.length; i++) {
			  if (alltags[i].className == "emailCloak") {
			  	var oldText = alltags[i].firstChild;
			  	var emailAddress = alltags[i].firstChild.nodeValue;
			  	var user = emailAddress.substring(0, emailAddress.indexOf("("));
			  	var website = emailAddress.substring(emailAddress.indexOf(")")+1, emailAddress.length);
			  	var newText = user+"@"+website;
			  	var a = document.createElement("a");
			  	a.href = "mailto:"+newText;
				var address = document.createTextNode(newText);
				a.appendChild(address);
				alltags[i].replaceChild(a,oldText);
			  }
			}
		}
	}
	window.onload = emailCloak;
</script>


</head>
<body>

<p>email address 1 : <span class="emailCloak">toto(at)eniris.com</span></p>
<p>email address 2: <span class="emailCloak">tata(at)eniris.com</span></p>


</body>
</html>

Résultat :

email address 1 : toto(at)eniris.com

email address 2: tata(at)eniris.com


Code 2 :

<script language="JavaScript" type="text/javascript"> <!--
     var login = 'tutu';
     var domaine = 'eniris.com';
	document.write('<a href=\"mailto:' + login + '@' + domaine + '\">');
	document.write(login + '@' + domaine + '</a>');
// --> </script>

Résultat :

email adress :