div+css实现鼠标放上去，背景跟图片都会变化。

NewDocumentul{list-style:none;}a{padding-left:1.5em;font-size:12px;height:23px;line-height:23px;color:gray;text-decoration:none;}a:link,a:visited{background:url(/article/upimages/bbs_bg_off.gif);}a:hover,a:active{background:url(/article/upi