make clickable element with clickable class open link in new window

HTML

<div class='clickable-blank some-padding'>
<a href='https://kruxor.com/view/code/ZJEyX/'>Im a Link</a>
But this whole div should be clickable and open in a _blank tab
</div>

CSS

.some-padding {
padding:20px;
border-radius:10px;
background:#999;
}
.clickable-blank {
cursor:pointer;
}

Javascript

$(document).ready(function(){
$('.clickable-blank').click(function(){
    var a_ele = $(this).find('a').attr('href');
  	window.open(a_ele,'_blank');
    return false;
});
});