How to make html menu for JavaScript call?

There's a helpful resource at W3C to see what events are available from which HTML elements, and to figure out what to do in the JS another resource that tells you what properties JavaScript can access in which HTML elements.

As for the code. You'll want to attach a JS listener to the onchange event of the select element.

The HTML

<select id="chose" onchange="dropDownSelectionChange(this.form.chose)">

The JavaScript

function dropDownSelectionChange(dropdown)
{
    // the selected index in the dropdown
    var idx  = dropdown.selectedIndex
    // the selected value in the dropdown
    var value = dropdown.options[idx].value

    // do some work here.
}

Happy coding.

update

HTML

<ul>
  <li id="one" onclick="doStuff(this);">one</li>
</ul>

JS

function doStuff (elem) {
  alert(elem.id);
  return false;
}

if you want you can wrap the text in the LI element in an html anchor to get it highlighted as a link or do this with css whichever way you prefer.