function ShowHide(target) {
elementList = document.getElementsByClassName("vraag_antwoord");
for(i=0;i<elementList.length;i++) {
elementList[i].style.display = 'none';
}
if (document.getElementById(target).style.display == 'block') {
document.getElementById(target).style.display = 'none';
}else{
document.getElementById(target).style.display = 'block';
}
}