function checkEmail() {
	var email = document.getElementById('txtEmail');
	var filter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email.value)) {
		alert('Inserire un indirizzo email valido');
		email.focus();
		return false;
	}else{
		return true;
	}
}
function checkCapcha(){
try{
	new Ajax.Request("checkCapcha.php",
		{
			method: "get",
			parameters: "value="+$F("txtCapcha"),
			onSuccess: function(requester){
				
				if(requester.responseText=="OK"){
				document.getElementById("formGuestbook").submit();
				}
				else {
					alert("Capcha code errato");
					return false;
					}
			}
			}
			);
	}catch(exception){
		alert(exception.message);
	}
		
}
function check(){
	if(checkEmail()){
		//checkCapcha();
		document.getElementById("formGuestbook").submit();
	}
}


function filtra(e){
	var cmb=Event.element(e);
	var indirizzo=window.location.href;
	if(indirizzo.indexOf("&classe")!=-1) indirizzo=indirizzo.substring(0,indirizzo.indexOf("&classe"));
	window.location.replace(indirizzo+"&classe="+$F("cmbFiltroClasse"));
}

function windowLoad(e){
	if($("cmbFiltroClasse")) Event.observe($("cmbFiltroClasse"),"change",filtra);
}
Event.observe(window,"load",windowLoad);