未知宽高图片垂直居中

<li><div class="ttu"><span><a href="#"><img src="images/hua.jpg" /></a></span></div><div class="bzi"><a href="#">吉祥如意</a><br />估价:<font color="#AA0000">240.00</font></div></li>



.ttu{
 width:113px;
 height:113px;
 position:relative;
 border:1px solid #CCC;
 display:table-cell;
 vertical-align:middle; 
}
.ttu span{
 position:static;
 *position:absolute;
 top:50%;
 writing-mode:tb-rl;
}

.ttu img{
 position:static;
 *position:relative;
 top:-50%;
 left:-50%;
 vertical-align:middle;
}