HTML:
<div id=#liste>
<div class=field-image>div1</div>
<div class=field-image>div2</div>
<div class=field-image>div3</div>
<div class=field-image>div4</div>
</div>
JAVASCRIPT:
var maxHeight = -1;
$("#liste .field-image").each(function() {
var h = $(this).height();
maxHeight = h > maxHeight ? h : maxHeight;
});
$("#liste .field-image").height(maxHeight);