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http://stackoverflow.com/questions/28517371/get-number-of-files-in-folder-with-ajax

$(function() {
		$.ajax({
		  url: "/melange/backgrounds/" // file directory you want to query
		})
		.done(function(data) {
			$("nav").empty();
			var x = 1;
			$(data).find("a").each(function(i) {
					if(i > 5)
					{
						$("nav").append("<a href='backgrounds/" + $(this).html() + "'>" + x + "</a>");
						x++;
					}
			});
    });
});