Get Square And A Select?

I have the following code:

function createSquare(event) {
var x = parseInt(event.clientX);
var y = parseInt(event.clientY);[code].....

This shows me a square and a select but the select isn't populated with anything.i do have a form later on down the page. The form code is (which I try and pull in the info from the select in the form in the select in the createSquare:

<form action="" name="tag" method="post">
<input type="hidden" name="picture_id" value="4">
<select name="tagged_person" id="tagged_person">[code]....