function navMouseOver(cell)
{
    if (cell.className != 'active')
        cell.className = 'hover';
}

function navMouseOut(cell)
{
    if (cell.className == 'hover')
        cell.className = '';
}

function navClick(cell)
{
    var link = cell.getElementsByTagName('a')[0];
    if (link)
        window.location.href = link.href;
}