FB como a janela de imagem JS

<div id="mImageBox">
<img id='my_image' src='' alt='' width="auto" height="auto" onclick="fbs_click(this)"/>
</div>

<script>
     function fbs_click(TheImg) {
     u=TheImg.src;
     // t=document.title;
    t=TheImg.getAttribute('alt');
    window.open('http://www.facebook.com/sharer.php?u='+encodeURIComponent(u)+'&t='+encodeURIComponent(t),'sharer','toolbar=0,status=0,width=626,height=436');return false;
}
</script>
Impossible Iguana