function toggle_visibility(id) {
if (id=="m_dames")
{
document.getElementById('m_dames').style.display = 'block';
document.getElementById('m_heren').style.display = 'none';
document.getElementById('m_schoenen').style.display = 'none';
}

if (id=="m_heren")
{
document.getElementById('m_dames').style.display = 'none';
document.getElementById('m_heren').style.display = 'block';
document.getElementById('m_schoenen').style.display = 'none';
}

if (id=="m_schoenen")
{
document.getElementById('m_dames').style.display = 'none';
document.getElementById('m_heren').style.display = 'none';
document.getElementById('m_schoenen').style.display = 'block';
}
}