function showlist()
{
document.getElementById('catsub').style.visibility= 'visible';
}

function closelist()
{
document.getElementById('catsub').style.visibility= 'hidden';
}

function overlay()
{
document.getElementById('vgo').style.visibility= 'visible';

}

function sluitoverlay()
{
document.getElementById('vgo').style.visibility= 'hidden';
}