function clear_field(obj)
{
    if( obj.value == 'Votre code postal' )
    {
        obj.value = '';
    }
}
function fill_field(obj)
{
    if( obj.value == '' )
    {
        obj.value = 'Votre code postal';
    }
}

function gotoUrlNewWinSimple(url)
{
    newWin = window.open(url, "newWin" + getRandomInt(20000));
}
function getRandomInt(max)
{
    return Math.round( Math.random() * (max-1) );
}