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<html>
<body oncontextmenu="return false;">
<script src="jquery-1.3.2.min.js"></script>
<script>
$(document).ready(function()
{
    $(document).mousedown(function(e)
    {
        if (e.button == 2) //right click
        {
            document.body.style.backgroundColor = "green";
        }
        else //left click
        {
            document.body.style.backgroundColor = "blue";
        }
    });
});
</script>
</body>
</html>