How to use JS to trigger a GIF animation?

I have an animated GIF that plays once (doesn’t loop). I would like it to animate when clicked. I tried something like this:

 $('#plus').click(function(){
    $('#plus').attr('src','');
    $('#plus').attr('src','img/plus.gif')
 });

With the hope that quickly resetting the src would trigger the animation, but no luck. Anyone know what would do it?

Answer

Try adding the image with a randomly generated querystring so it looks like a new image to the browser.

<script language="javascript" type="text/javascript">
function randomString() {
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
    var string_length = 8;
    var randomstring = '';
    for (var i=0; i<string_length; i++) {
        var rnum = Math.floor(Math.random() * chars.length);
        randomstring += chars.substring(rnum,rnum+1);
    }
    document.randform.randomfield.value = randomstring;
}
$('#plus').click(function(){
    $('#plus').attr('src','img/plus.gif?x=' + randomString())
    });
</script>