Edit in JSFiddle

<script type='text/javascript'>
//<![CDATA[
var bloggAdmin= [
  "URL ADMIN PERTAMA", // Admin 1
  "URL ADMIN KE DUA",  // Admin 2
  "URL ADMIN KE TIGA"  // Admin 3
];
$.each(bloggAdmin, function(i) {
  $('a[href="' + bloggAdmin[i] + '"]').closest('.comment_inner').css('border-top', '5px solid #30abd5');
});
//]]>
</script>