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margin: 0 auto;で実現可能です。
margin-left: auto;
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="http://blog-imgs-43.fc2.com/a/n/i/anigoo/jquery-colorbox-min.js" ></script>
<link rel="stylesheet" type="text/css" href="http://blog-imgs-43.fc2.com/a/n/i/anigoo/colorbox.css" media="screen" />
<script type="text/javascript">
$(document).ready(function(){$('a[rel="gallery"],a[href$=".jpg"], a[href$=".gif"], a[href$=".png"],a[href$=".JPG"], a[href$=".GIF"], a[href$=".PNG"]').colorbox({maxHeight:"95%",maxWidth:"95%",current: "{current} of {total}",initialWidth: "50",initialHeight:"50"});});
</script>
height: 30px;
line-height: 30px;
white-space: pre;
.hamidasuna {
text-overflow: ellipsis;
overflow: hidden;
width: 150px;
white-space: nowrap;
-webkit-text-overflow: ellipsis;
-o-text-overflow: ellipsis;
}