firstname="luc";
lastname="brun";
laburl="ensicaen.fr";

function email()
{
	return firstname+"."+lastname+"@"+laburl;
}

    function add_email(obj)
    {
        var a=document.createElement("a");
	var link=document.createAttribute("href");
	link.value="mailto:"+email();
	var messg=email();
	var sons=obj.childNodes;
	for(i=0;i<sons.length;i++)
		if(sons.item(i).nodeType==3)	
		{
			messg=sons.item(i).nodeValue;
			obj.removeChild(sons.item(i));
		}
	var text=document.createTextNode(messg);
	a.setAttributeNode(link);
	a.appendChild(text);
	obj.appendChild(a);
    }
     function set_emails()
     {
	 var emails=document.getElementsByTagName("SPAN");
	 for(i=0;i<emails.length;i++)
	     {      
		 if(emails[i].className=="email")	      
		     {
			 add_email(emails[i]);  
		     }
	     }
     }