function ToggleTimeTableValue(hiddenFieldID, timeTableCell, valueToToggle)
{
    var hiddenField = document.getElementById(hiddenFieldID);
    var searchValue = '|' + valueToToggle + ';';
    
    if (hiddenField.value.indexOf(searchValue) > -1)
    {
        hiddenField.value = hiddenField.value.replace(searchValue, '');
        timeTableCell.className = 'TimetableCell';
    }
    else
    {
        hiddenField.value = hiddenField.value + searchValue;
        timeTableCell.className = 'TimetableCell Active';
    }
}