function upd_altezza_footer(){
	//funzione altezza_footer definita in inc_footer.php
	document.getElementById('footer').style.top = altezza_footer('corpo')+'px';
}
function mostra_loading(){
	busy=getBusyOverlay('viewport',{color:'black', opacity:0.8, text:'<br>Caricamento in corso ...', style:'font-weight:bold;font-size:12px;color:white'},{color:'#FF8A21', size:50, type:'o'});
}
function nascondi_loading() {
	busy.remove();
}
function ShowHide(id){
if(document.getElementById){
    var el=document.getElementById(id);
    el.style.display = (el.style.display=="block") ? "none" : "block";
    }
}
function HideAndShow(id1,id2){
if(document.getElementById){
    el1=document.getElementById(id1);
    el2=document.getElementById(id2);
    if(el1.style.display=="none"){
        el1.style.display="block";
        el2.style.display="none";
        }
    else{
        el1.style.display="none";
        el2.style.display="block";
        }
    }
}
function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}