Probá:
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>Documento sin título</title>
<style>
#pp{ width:50px; height:50px; background:#900; cursor:pointer}
</style>
<script>
/*-- funciones auxiliares --*/
function t(id){return document.getElementById(id);}
function addEvent(obj,fun,type){
if(obj.addEventListener){
obj.addEventListener(type,fun,false);
}else if(obj.attachEvent){
var f=function(){
fun.call(obj,window.event);
}
obj.attachEvent('on'+type,f);
obj[fun.toString()+type]=f;
}else{
obj['on'+type]=fun;
}
}
/*-- finciones auxiliares --*/
onload=function(){
addEvent(
t('pp'),
function(e){
var evt=e || event;
if(evt.button==2)
alert('hizo click con botón derecho');
},
'mousedown');
document.oncontextmenu=function(){return false}
}
</script>
</head>
<body>
<div id="pp"></div>
</body>
</html>