mortido,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
#logger {
width: 300px;
height: 100px;
background-color: #00FF00;
}
</style>
</head>
<body>
<script>
function blockMenu(obj) {
alert(obj.id)
}
document.oncontextmenu = function(event) { blockMenu(event.target); return false; };
</script>
<body>
<div id="logger">click me</div>
</body>
</body>
</html>