<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div id="loginbox" style="margin-top:50px;" class="mainbox col-md-6 col-md-offset-3 col-sm-8 col-sm-offset-2">
<div class="panel panel-info" >
<div class="panel-heading">
<center><div class="panel-title">Panel de registro</div></center>
</div>
<div style="padding-top:30px" class="panel-body" >
<div style="display:none" id="login-alert" class="alert alert-danger col-sm-12"></div>
<form id="registerform" class="form-horizontal" role="form">
<div style="margin-bottom: 25px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
<input id="register-username" type="text" class="form-control" name="username" value="" placeholder="Tu nombre.">
</div>
<div style="margin-bottom: 25px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-envelope"></i></span>
<input id="register-email" type="email" class="form-control" name="email" placeholder="Tu correo electronico.">
</div>
<div style="margin-bottom: 25px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-lock"></i></span>
<input id="register-password" type="password" class="form-control" name="password" placeholder="Tu contraseña.">
</div>
<div style="margin-bottom: 25px" class="input-group">
<span class="input-group-addon"><i class="glyphicon glyphicon-pencil"></i></span>
<input id="register-repeat-password" type="password" class="form-control" name="password" placeholder="Repite tu contraseña">
</div>
<div style="margin-top:10px" class="form-group">
