function WriteNo()
{
    if ((event.keyCode < 48) || (event.keyCode > 57))
        event.returnValue = false;
    if (event.keyCode == 13)
        event.returnValue = true;
    if (event.keyCode == 46)
        event.returnValue = true;
}

function WriteNum()
{
    if ((event.keyCode < 48) || (event.keyCode > 57))
        event.returnValue = false;
    if (event.keyCode == 13)
        event.returnValue = true;
    if (event.keyCode == 46)
        event.returnValue = true;
}


function WriteNothing()
{
  event.returnValue = false;
}