Edit in JSFiddle

    $('.fade').children().hover(function() {
        $(this).siblings().stop().fadeTo(300, 0.3);
    }, function() {
        $(this).siblings().stop().fadeTo(300, 1);
    });

    <div class="fade" id="excepts">
        <img src="http://farm7.staticflickr.com/6152/6200066753_f11d5d1a24_m.jpg" />
        <img src="http://farm5.staticflickr.com/4027/5126784725_5bd45c388b_m.jpg" />
        <img src="http://farm5.staticflickr.com/4140/4814425438_74950c5751_m.jpg" /><br/>
        <img src="http://farm5.staticflickr.com/4121/4945056921_6a799f9ce9_m.jpg" />
        <img src="http://farm5.staticflickr.com/4110/4837129900_8152bd99d7_m.jpg" />
        <img src="http://farm5.staticflickr.com/4107/4945057923_019540e681_m.jpg" />
</div><div class="clear"><a href="http://www.flickr.com/photos/arcticpuppy/sets/72157616071232647/">Photo by Portraits CC-BY</a></div>