I have a dropdown menu in html but the menu go under/below the javascript of Fusion app. Can you use Z-order to correct this. How?

<div id="wrapper">
<div id="border">
<div id="canvas">
<canvas id="MMFCanvas" width="640" height="480">
<p>Your browser does not support Canvas.</p>
</canvas>
</div>
</div>
</div>
<script>
// RUNTIMESTART
// This is where the HTML5 runtime is actually started
window.addEventListener("load", windowLoaded, false);
function windowLoaded()
{
// Calls the runtime
// First parameter : name of the canvas element
// Second parameter : path to the cch file. Images and sounds must lay beside this file
new Runtime("MMFCanvas", "resources/butlist.cch");
}
// RUNTIMESTARTEND
</script>