function checkFieldsLogin()
{
    f = document.form2;
    if( f.user.value ==  "username" || f.user.value.length == 0 )
    {
        alert( "Please enter a valid username" );
        f.user.focus();
        return false;
    }
    else if( f.pass.value == "password" || f.pass.value.length == 0 )
    {
        alert( "Please enter a valid password" );
        f.pass.focus();
        return false;
    }
    else
    {
        return true;
    }
}

function checkFieldsRegistration()
{
    f = document.registrationForm;
    if( f.username.value.length == 0 )
    {
        alert( "Please type your username" );
        f.username.focus();
        return false;
    }
    else if( f.password.value.length == 0 )
    {
        alert( "Please type your password" );
        f.password.focus();
        return false;
    }
    else if( f.firstname.value.length == 0 )
    {
        alert( "Please type your first name" );
        f.firstname.focus();
        return false;
    }
    else if( f.lastname.value.length == 0 )
    {
        alert( "Please type your last name" );
        f.lastname.focus();
        return false;
    }
    else if( f.address.value.length == 0 )
    {
        alert( "Please enter your address" );
        f.address.focus();
        return false;
    }
    else if( f.city.value.length == 0 )
    {
        alert( "Please enter a city name" );
        f.city.focus();
        return false;
    }
    else if( f.phone.value.length == 0 )
    {
        alert( "Please enter a phone number" );
        f.phone.focus();
        return false;
    }
    else if( f.email.value.length == 0 )
    {
        alert( "Please enter your email address" );
        f.email.focus();
        return false;
    }
    else
    {
        return true;
    }
}

function show_confirm()
{
  if (confirm("Are you sure you want to move this song ?"))
     return true;

  return false;
}