function toggleMenu(id)
{
let node = document.getElementById(id);
if(node)
node.style.display = node.style.display == "block" ? "none" : "block";
}
...
<button onclick="toggleMenu('menuid')">Развернуть</button>
function toggleMenu(id)
{
let node = document.getElementById(id);
if(node)
node.style.display = node.style.display == "block" ? "none" : "block";
}
...
<button onclick="toggleMenu('menuid')">Развернуть</button>