<div class="form-group">
	<div class="col-sm-offset-4 col-sm-4">
		<input type="submit" class="btn btn-primary btn-lg disabled" value="Please wait 15 second">
	</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script>setTimeout( function() { $("#t_button").attr("class", "btn btn-primary btn-lg"); $("#t_button").attr("value", "->"); } , 15000);</script>