我想水平对齐我的三个图像而不是垂直对齐什么是最简单的方法来实现这一点?例子
<div id="christmas_promotion_boxes">
<div id="christmas_promo_1">
<img src="http://lilliemcferrin.com/wp-content/uploads/2013/09/vivid_flowers-wide.jpg" width="200" height="100">
</div>
<div id="christmas_promo_2">
<img src="http://lilliemcferrin.com/wp-content/uploads/2013/09/vivid_flowers-wide.jpg" width="200" height="100">
</div>
<div id="christmas_promo_3">
<img src="http://lilliemcferrin.com/wp-content/uploads/2013/09/vivid_flowers-wide.jpg" width="200" height="100">
</div>
</div>
#christmas_promotion_boxes {width:1000px; margin:0 auto 0 auto; text-align:center;}