Images - Radiobuttons

I want to use images as radiobuttons. Everything is ok in Chrome and Firefox. But in IE it doesn't work... Test URL: http://ift.tt/1ND2rAu

CSS and HTML:

label > input{ /* HIDE RADIO */
  display:none;

}
label > input + img{ /* IMAGE STYLES */
  cursor:pointer;
  border:2px solid transparent;

}

<label>
<input type="radio" name="shape" value="round" checked />
<img id="roundShape" src="css/images/round.jpg">
</label>