function checkdata(){
	var response = true;
	

	if (document.getElementById('id_prodotto').selectedIndex == 0){
		alert("Select a product to view the schedule");
		document.getElementById("id_prodotto").focus();
		response = false;
		return (response);
	}
	
	document.form1.action = document.getElementById('id_linea').options[document.getElementById('id_linea').selectedIndex].title + "/scheda_prodotto.php?idp="+document.getElementById('id_prodotto').options[document.getElementById('id_prodotto').selectedIndex].value;

}

function cambia_fase(fase){
	
	document.getElementById("fase").value = fase;
	document.form1.submit();
	
}