function openHint(id)
{
    var theHintBody = document.getElementById(id);
    if(theHintBody)
    {
        theHintBody.style.visibility = 'visible';
    }    
}

function closeHint(id)
{
    var theHintBody = document.getElementById(id);
    if(theHintBody)
    {
        theHintBody.style.visibility = 'hidden';
    }    
}