function toonmenu(elmnt)
{
document.all(elmnt).style.visibility="visible"
}
function verstopmenu(elmnt)
{
document.all(elmnt).style.visibility="hidden"
}

function toonbeschrijving(elmnt)
{	document.all(elmnt).style.visibility="visible"
}

function verstopbeschrijving(elmnt)
{	document.all(elmnt).style.visibility="hidden"
}