<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>

function divoption(id){

if ( id == 1 ){
$('#radio2').slideUp('medium');
$('#radio1').slideDown('medium');

}else{

$('#radio1').slideUp('medium');
$('#radio2').slideDown('medium');
}
}
</script>

<input type="radio" name="radio" id="radio1" value="falan" onclick="divoption(1);" /> radio1

<input type="radio" name="radio" id="radio2" value="filan" onclick="divoption(2);"/> radio 2

<div id="radio1" style="display:none">div 1</div>
<div id="radio2" style="display:none">div 2</div>