' Toggles hide / show
function myFunction(div_id) {
var x = document.getElementById(div_id);
if (x.style.display === "none") {
x.style.display = "block";
} else {
x.style.display = "none";
}
}
// Hide div :
document.getElementById(div_id).style.display = none;
/// Show div :
document.getElementById(div_id).style.display = block;