function show_submenu(text){
document.getElementById('onder_menu').style.display = "block";
document.getElementById('onder_menu').innerHTML = text ;
}

function hide_submenu(text){
document.getElementById('onder_menu').style.display = "none";
document.getElementById('onder_menu').innerHTML = '..' ;
}
function show_toelichting(text){
document.getElementById('toelichting').style.display = "block";
document.getElementById('toelichting').innerHTML = text ;
}

function hide_toelichting(text){
document.getElementById('toelichting').style.display = "none";
document.getElementById('toelichting').innerHTML = '..' ;
}