求不改变图片排列，让两边边距一样，能否定义整个模块居中，不定义模块距离值
<div class="w_1100 sy-hzhb">
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017192293.gif" alt="21cn财经" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017194633.gif" alt="凤凰财经" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017195413.gif" alt="工商银行" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017196037.gif" alt="光大银行" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017196661.gif" alt="建设银行" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017197285.gif" alt="中国经营报" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017198377.gif" alt="农业银行" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017198689.gif" alt="新浪网" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017200249.gif" alt="招商银行" /></a>
<a href="#"><img src="http://bxw2359810293.my3w.com/e/upload/s1/fck/image/2016/08/03/1017200717.gif" alt="中国银行" /></a>
</div>
这是想要达到的两边居中效果
