function ChangeStatusLetter()
{

    var drpLetters = document.getElementById("drpLetters");
    var chkWindowsKey = document.getElementById("chkWindowsKey");
    
    if (chkWindowsKey.value = true){
        drpLetters.style.enabled = "true";
    }
    else
    {
        drpLetters.style.enabled = "false";
    }
}