function InitLoading(){
    var corpo = document.getElementById("centrato");
    if(corpo){
        //<div id="loading"><span>Loading...</span></div>
        var loading = document.createElement('div');
        loading.style.display = "none";
        var span_loading = document.createElement('span');
	corpo.appendChild(loading);
        loading.id = "loading";
        loading.appendChild(span_loading);
        span_loading.appendChild(document.createTextNode("In caricamento..."));
    }
}