var ul = document.createElement('ul'),
    li1 = document.createElement('li'),
    li2 = document.createElement('li');

li1.appendChild(document.createTextNode('hello'));
li2.appendChild(document.createTextNode('world'));
li1.onclick = myevent;
li2.onclick = myevent;

ul.appendChild(li1);
ul.appendChild(li2);

document.body.appendChild(ul);