怎样实现图片和文字垂直居中

<article>
    <div class="left">
        <img src="http://ubmcmm.baidustatic.com/media/v1/0f000nYQaO_UI6DhjPksj6.png" />
    </div>
    <div class="right">
        <a href="http://blog.segmentfault.com/joyqi/1190000000407476">
            <p>SegmentFault 2014年招聘第一季：</p>
            <p>后端开发工程师</p>
        </a>
    </div>
</article>
<article>
    <div class="left">
        <img src="http://ubmcmm.baidustatic.com/media/v1/0f000nYQaO_UI6DhjPksj6.png" />
    </div>
    <div class="right">
        <a href="http://blog.segmentfault.com/joyqi/1190000000407476">
            <p>SegmentFault 2014年招聘第一季：</p>
            <p>后端开发工程师</p>
        </a>
    </div>
</article>
<article>
    <div class="left">
        <img src="http://ubmcmm.baidustatic.com/media/v1/0f000nYQaO_UI6DhjPksj6.png" />
    </div>
    <div class="right">
        <a href="http://blog.segmentfault.com/joyqi/1190000000407476">
            <p>SegmentFault 2014年招聘第一季：</p>
            <p>后端开发工程师</p>
        </a>
    </div>
</article>

<style type="text/css">
article{display:block;}
.left{float:left;}
.right{width:800px;text-align:center;}
.right:hover {background:red;cursor:pointer;}
.right a{display:block;}
</style>



<script>
window.onload = function() {
var d = document, arts = d.querySelectorAll('article');
for(var i=arts.length-1; i>=0; i--) {
    var h = arts[i].querySelector('.left').clientHeight, r = arts[i].querySelector('.right'), a = r.querySelector('a');
    r.style.height = h + 'px';
    a.style.padding = (h - a.clientHeight)/2 + 'px 0';
    r.onclick = function() {this.querySelector('a').click();}
}
}
</script>