vimeo thumbnail generator

HTML

<ul class='vimeo-links'>
<li><a class='vimeo-thumb' href='https://vimeo.com/477786056'>Chroma Pt. III</a></li>
<li><a class='vimeo-thumb' href='https://vimeo.com/471847630'>Dancer Boy</a></li>
</ul>

Javascript

$( ".vimeo-thumb" ).each(function() {
   var thumb_id = $(this).attr("data-id"); 
   vimeoLoadingThumb(thumb_id);
});

function vimeoLoadingThumb(id){    
    var url = "http://vimeo.com/api/v2/video/" + id + ".json?callback=showThumb";
      
    var id_img = "#vimeo-" + id;
    var script = document.createElement( 'script' );
    script.type = 'text/javascript';
    script.src = url;

    $(id_img).before(script);
}

function showThumb(data){
    var id_img = "#vimeo-" + data[0].id;
    $(id_img).attr('src',data[0].thumbnail_large);
}