The following code shows how to fade tab pane.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.8.3.js'></script>
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
</head><!-- w ww. j av a 2 s . c om-->
<body>
<div class="my-example">
<ul id="myTab" class="nav nav-tabs">
<li class=""><a href="#home" data-toggle="tab">Home</a></li>
<li class=""><a href="#profile" data-toggle="tab">Profile</a></li>
<li class="dropdown active"><a href="#" class="dropdown-toggle"
data-toggle="dropdown">Dropdown <b class="caret"></b></a>
<ul class="dropdown-menu">
<li class="active">
<a href="#dropdown1" data-toggle="tab">t</a></li>
<li><a href="#dropdown2" data-toggle="tab">a</a></li>
</ul></li>
</ul>
<div id="myTabContent" class="tab-content">
<div class="tab-pane fade" id="home">
<p>Raw denim you probably haven't heard of them jean shorts
Austin.</p>
<p style="display: none">mytext1</p>
</div>
<div class="tab-pane fade" id="profile">
<p>Food truck fixie locavore, accusamus mcsweeney's marfa nulla
single-origin coffee squid.</p>
<p style="display: none">mytext2</p>
</div>
<div class="tab-pane fade active in" id="dropdown1">
<p>Etsy mixtape wayfarers, ethical wes anderson tofu before they
sold out mcsweeney's organic lomo retro fanny pack lo-fi
farm-to-table readymade.</p>
<p style="display: none">mytext3</p>
</div>
<div class="tab-pane fade" id="dropdown2">
<p>Trust fund seitan letterpress, keytar raw denim keffiyeh etsy
art party before they sold out master cleanse gluten-free squid
scenester freegan cosby sweater.</p>
<p style="display: none">mytext4</p>
</div>
</div>
<button onclick="sendTextToServer('aaaa')" id="sendButton"
status="initial">Send now</button>
</div>
</body>
</html>