[Deff]

Хочу вытащить div, в котором лежит img_3

<script type="text/javascript" src="http://yandex.st/jquery/1.4.4/jquery.min.js"></script>
<div id="wrapper">
	<div class="cur_div"><img src="images/content/img_1.jpg" alt="1"></div>
	<div><img src="images/content/img_2.jpg" alt="2"></div>
	<div data="Tут лежит клад(img_3.jpg)"><img src="images/content/img_3.jpg" alt="3"></div>
</div>

<script type="text/javascript">
var Fimg='img_3.jpg'
var Seek = $(".cur_div").parent().find("img[src$='"+Fimg+"']").parent();
alert(Seek.attr("data"))
</script>

Или

<script type="text/javascript" src="http://yandex.st/jquery/1.4.4/jquery.min.js"></script>
<div id="wrapper">
	<div class="cur_div"><img src="images/content/img_1.jpg" alt="1"></div>
	<div><img src="images/content/img_2.jpg" alt="2"></div>
	<div data="Tут лежит клад(img_3.jpg)"><img src="images/content/img_3.jpg" alt="3"></div>
</div>

<script type="text/javascript">
var Fimg='img_3.jpg'
var Seek = $("#wrapper").find(" div > img[src$='"+Fimg+"']").parent();
alert(Seek.attr("data"))
</script>