mousedown - NO SIGN.....

mousedown - NO SIGN.....

Why do I get a NO SIGN (IE8 and FF) when I mousedown to drag this??? Once you mouseup, you can drag it around without the NO SIGN....
<!DOCTYPE html>
<html>
<head>
    <script src="jquery-1.4.1.min.js"></script>
</head>
<img id="test" src="controlHANDLE.png" style="position:relative;">
<script>
$(function() {
    var testLISTENER;
    $("#test").mousedown(function(e) {
        controlLISTENER = function(e) {
            var x = e.pageX;
            var y = e.pageY;
            $("#test").css({ 'left' : x});
            $("#test").css({ 'top' : y});
        }
        $("body").bind("mousemove", controlLISTENER );
    })

})
</script>
</body>
</html>