CSS代码：

        .img-box{background:#EFEFEF; padding:20px;}
.img-box li{float:left; margin-right:10px; padding:5px; background:#fff; overflow:hidden;}
.img-box li a{float:left; overflow:hidden; text-align:center; position:relative;}
.img-box li a img{position:relative; vertical-align:text-top;}
/*themes*/
.themes1 li{width:200px; height:200px;}/*容器宽高*/
.themes1 li a{width:200px; height:200px;}/*容器宽高*/
.themes2 li{width:100px; height:100px;}
.themes2 li a{width:100px; height:100px;}
.themes2 li a img{ margin-top: -5px; margin-left: -5px}
.themes3 li{width:120px; height:90px;}
.themes3 li a{width:120px; height:90px;}
                

JS代码，默认的参数及调用：

        //默认的参数
         $(".themes1 .t-img").VMiddleImg();
         $(".themes2 .t-img").VMiddleImg({"width":110,"height":110});
         $(".themes3 .t-img").VMiddleImg();