To make a horizontal button set, add the data-type=’horizontal’ to the fieldset.
<!DOCTYPE html>
<html>
<head>
<link href='http://code.jquery.com/mobile/1.4.0/jquery.mobile-1.4.0.min.css' rel='stylesheet'/>
<script src='http://code.jquery.com/jquery-1.10.2.min.js'></script>
<script src='http://code.jquery.com/mobile/1.4.0/jquery.mobile-1.4.0.min.js'></script>
<title>Upwhere</title>
</head>
<body>
<div data-role='page'>
<div data-role='header'><h1>Horizontal Radio Buttons</h1></div>
<br>
<p>Horizontal Radio Buttons</p>
<form>
<fieldset data-role='controlgroup' data-type='horizontal'>
<input type='radio' name='radio_choice' id='radio_choice_id1' value='on' checked='checked'>
<label for='radio_choice_id1'>One</label>
<input type='radio' name='radio_choice' id='radio_choice_id2' value='off'>
<label for='radio_choice_id2'>Two</label>
<input type='radio' name='radio_choice' id='radio_choice_id3' value='other'>
<label for='radio_choice_id3'>Three</label>
</fieldset>
</form>
<div data-role='footer' data-position='fixed'>
<h1>Footer</h1>
</div>
</div>
</body>
</html>