css一张图片加载所有图需

.content .navigation dl dt span{display:inline-block;width:16px;height:16px;margin-right:3px;background:url("my_common.png-t=201212271141.png") no-repeat;vertical-align:-3px;*vertical-align:middle}
.content .navigation dl dt .nav_order{background-position:0 -37px}
.content .navigation dl dt .nav_account{background-position:0 -58px}
.content .navigation dl dt .nav_user{background-position:0 -78px}