Using JavaSctipt inside More Options>HTML

I’d like to use something like that:

<script>
document.getElementById(“l1″).style.color=”blue”;
document.getElementById(“l2″).style.color=”red”;
</script>

indisde HTML place in More Options menu to change color of font, depending which picture is showing, is that possible at all?

http://wordpress.org/extend/plugins/camera-slideshow/