Sortable tests: Added alt attributes to images.

Author: scottgonzalez

tests/unit/sortable/sortable.html

@@ -85,10 +85,10 @@ <h2 id="qunit-userAgent"></h2>
 </table>
 
 <div id="sortable-images">
-	<img src="../images/jqueryui_32x32.png">
-	<img src="../images/jqueryui_32x32.png">
-	<img src="../images/jqueryui_32x32.png">
-	<img src="../images/jqueryui_32x32.png">
+	<img src="../images/jqueryui_32x32.png" alt="">
+	<img src="../images/jqueryui_32x32.png" alt="">
+	<img src="../images/jqueryui_32x32.png" alt="">
+	<img src="../images/jqueryui_32x32.png" alt="">
 </div>
 
 </div>