jQuery Find and Remove Duplicated Element IDs
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This example could be used to fix a featured article for your blogs so that not more than one article is featured on the homepage.
// featured article fix
var myFeatured = $('div.featured').attr('id');
var theHidden;
$('div.article').each(function(){
theHidden = $(this).attr('id');
if(theHidden == myFeatured){
$('div#'+theHidden).hide();
}
});