<style>
    .memdetails
    {
       background: #fafcfe;
       background-image: url(ваша картинка);
       border-bottom-width: 2px;
       border-right-width: 2px;
       padding: 4px 3px 4px 3px;
       margin: 3px 1px 3px 1px;
    }
    </style>

<script type="text/javascript">
    var arr=document.getElementsByTagName("li")
    i=0
    str=document.URL
    while(arr[i] ){
    if((arr[i].className=="pa-author online") || (arr[i].className=="pa-author") || (arr[i].className=="pa-title") || (arr[i].className=="pa-avatar item2") || (arr[i].className=="pa-reg") || (arr[i].className=="pa-posts") || (arr[i].className=="pa-respect") || (arr[i].className=="pa-positive") || (arr[i].className=="pa-ip") || (arr[i].className=="pa-online") || (arr[i].className=="pa-icq") || (arr[i].className=="pa-sex") || (arr[i].className=="pa-age") || (arr[i].className=="pa-time-visit")) {
    name=arr[i].innerHTML
    name=name.substring(0)
    arr[i].innerHTML="<div class=memdetails>"+name+"</div>"
    }
    i++
    }
    </script>

<style type="text/css">
.post-author ul li {
	text-align: center;
	padding: 10px;
	border: 1px solid #ffa500;
	background: #ffffc3;
	margin: 2px;
}
.post-author ul li.pa-reg {
	border-bottom: none;
	margin-bottom: 0px;
}
.post-author ul li.pa-posts, 
.post-author ul li.pa-respect {
	border-top: none;
	border-bottom: none;
	margin-top: 0px;
	margin-bottom: 0px;
}
.post-author ul li.pa-positive {
	margin-top: 0px;
	border-top: none;
	//border-bottom: none;
}
.post-author ul li.pa-online, .post-author ul li.pa-author {
	border: #4aab42 solid 1px;
	padding: 2px;
	background: url("картинку сюда ставим");
	font-size: 12px;
}
</style>