var message = "Material protegido por derechos de autor.";

function cutomizedcontextmenu(e) {
    var target = window.event ? window.event.srcElement : e ? e.target : null;
    if (navigator.userAgent.toLowerCase().indexOf("msie") != -1) {
        if (target.type != "text" && target.type != "textarea" && target.type != "password") {
            alert(message);
            return false;
        }
        return true;
    }
    else if (navigator.product == "Gecko") {
        alert(message);
        return false;
    }
} 


function click(e) {
        if (navigator.appName == 'Netscape' && (e.which == 3 || e.which == 2)) {
            //alert(message);
            return cutomizedcontextmenu(e);
        }
        else if (navigator.appName == 'Microsoft Internet Explorer' && (event.button == 2)) {
            //alert(message);
            return cutomizedcontextmenu(e);
        }
}

document.onmousedown = click;

//document.oncontextmenu = function() { return false }

//document.oncontextmenu = cutomizedcontextmenu;