мой вариант
<!DOCTYPE html>
<html>
<head>
<title>example</title>
</head>
<body>
<div style="display: none;">1</div>
<div style="display: none;">2</div>
<div style="display: none;">3</div>
<div style="display: block;">4</div>
<div style="display: none;">5</div>
<div style="display: none;">6</div>
<div style="display: block;">7</div>
<div style="display: none;">8</div>
<div style="display: none;">9</div>
<div style="display: block;">10</div>
<script src="http://code.jquery.com/jquery-2.1.3.min.js"></script>
<script>
var els = $('div'),
thsActive = els.eq(3),
collection = [];
els.each(function (i, el) {
if ($(el).css('display') === 'block' && thsActive !== el) {
collection.push(el);
}
})
console.log(collection)
</script>
</body>
</html>