jquery move div above others

jquery move div above others

halleo, this is an example i have
<div id="zero">
<div class=1></div>
<div class=1></div>
</div>
<div id="one">
<div class=1></div>
<div class=1></div>
<div class=2></div>
</div>
how can i move .2 between .1 and .1 in div#one? i have tried .prev() but
this does not work. this puts the .2 in the div#zero.