function controlLogin(){
	thisForm = document.form_login;
	
	if(thisForm.username.value==''){
		alert("Inserire un la propria username");
		thisForm.username.focus();
		return;
	}
	
	if(thisForm.password.value==''){
		alert("Inserire un la propria password");
		thisForm.password.focus();
		return;
	}
	
	thisForm.azione.value = "login";
	thisForm.submit();
}