Replace different text with different image

I try to replace different text with different image and want to add the code in to the template.

I tried this
<script type="text/javascript">
    jQuery(document).ready(function() {

    $(function(){
          $('itemExtraFields a:contains("Australia)').html('<img src="aussieflag.jpg"/>')
    });

</script>

seems not to work. Any help would be great