Add a class show to the two div and then you can use a toggle method. example http://jsfiddle.net/WSCBu/21/
shown here.
<div class="blue"></div>
<div class="gray show" style="display:none";>
<p> Show --> </p>
</div>
<div class="orange show">
<p> -- Hide </p>
</div>
$(document).on('click','.show',function(){
$('.show').toggle();
});