Así:
Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<script>
function addBind(obj,e,fn){
if (window.attachEvent) {
var f=function(){fn.call(obj,window.event);};
obj.attachEvent("on" + e, f); // IE
}else{
obj.addEventListener(e, fn, false); // FF
}
}
// veamos si es verdad
document.write('<div class="clasOk" id="test">Hola mundo</div>')
addBind(document.getElementById("test"),"click",function(){
alert(this.className); // IE: classOk, FF: classOk
})
</script>
</body>
</html>
Te recomiendo leas esto:
http://www.dustindiaz.com/javascript-no-no/