THIS CODE UNDER HERE WORKS, you can read the answers under here - i edit this for future reference.
HTML:
<div><a href="#" id="btn">Show bank div and hide fancy div</a></div>
<div id="btn-bk"><a href="#">back</a></div>
<div id="bank">Bank Div</div>
<div id="fancy">Fancy Div</div>
CSS:
#bank {display:none;}
#btn-bk {display:none;}
Javascript:
$('#btn').click(function(e){
$('#fancy, #btn').fadeOut('slow', function(){
$('#bank, #btn-bk').fadeIn('slow');
});
});
$('#btn-bk').click(function(e){
$('#bank, #btn-bk').fadeOut('slow', function(){
$('#fancy, #btn').fadeIn('slow');
});
});
Your problem is with this line of code:
$('#bank').replace('<div id="fancy"></div>').fadeIn('slow');
There is no .replace() function in jQuery. Remove that and it works:
$('#bank').fadeIn('slow');
See it here: http://jsfiddle.net/3XwZv/57/