function clearValue(obj, def)
{
    console.log(obj.value + " = " + def)
    if (obj.value == def)
    {
        obj.value = ""
    }
}

function fillValue(obj, def)
{
    console.log(obj.value + " = " + def)
    if (obj.value == "")
    {
        obj.value = def
    }
}