// JavaScript Document
function Zichtbaar(id, visibility, id1, visibility1) 
{
document.getElementById(id).style.display = visibility;
document.getElementById(id1).style.display = visibility1;
;
}

function Zichtbaar1(id, visibility, id1, visibility1)
{
document.getElementById(id).style.display = visibility;
document.getElementById(id1).style.display = visibility1;

}