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<!DOCTYPE html>
<html>
<body>

<p>Select a position in the list below to change the div's position.</p>

<div id="myDiv" style="top:50px;left:100px;">I am a div element.</div>

<select onchange="myFunction(this);" size="4">
  <option>absolute
  <option>fixed
  <option>static
  <option>relative
</select>

<script>
function myFunction(x) {
    var whichSelected = x.selectedIndex;
    var posVal = x.options[whichSelected].text;
    var elem = document.getElementById("myDiv");
    elem.style.position=posVal;
}
</script>

</body>
</html>