function login()
{
	var username = $('login_usr').value;
	var password = $('login_pwd').value;
	
	if (username.trim() == "" || password.trim() == "")
	{
        alert("inserire utente e password");
		return;
	}
	
	window.location.replace('login.php?login_username=' + username + '&login_password=' + password);
	
}


function login_key(ev)  
{
    if(window.event)  
	{
	    if (event.keyCode == 13)  
		{
		    login();
		}	           
    }
	else  
	{
	    if(ev.which == 13)    
		{
		    login();
		}
    }
}	


function logout()
{
	 if (confirm("uscire?"))
	     window.location.replace('logout.php');
}