function test(){
var headings = document.getElementsByTagName("h2");
var nav = document.createElement("NAV");
var navList = document.createElement("ul");
document.getElementsByTagName("body")[0].appendChild(nav);
nav.appendChild(navList);
for (var i = 0; i < headings.length; i++){
    var li = document.createElement("li");
	li.innerHTML = headings[i].innerHTML;
	navList.appendChild(li);
    }
nav.appendChild(navList);
document.getElementById("test").innerHTML = nav;
}
window.onload = test;