This will get all the elements inside each element containing the class sampleclass:
var myArray = $('.sampleclass *');
*called All selector
EDIT : note that in this example:
<div id="test">
<table>
<tr><td>TEST</td></tr>
</table>
</div>
var myArray = $('#test *');
myArrayIt contains all of the sub-div: table, trand td.
, , :
var myArray = $('#test > *');
.