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MyFouce呈现的时候图片与div出现错位

<!----- html ---->
<link href="css/main.css" rel="stylesheet" type="text/css" />
<script src="js/setHomeSetFav.js" type="text/javascript"></script>
<script src="js/myfocus-2.0.1.min.js" type="text/javascript"></script>
<script src="js/mf-pattern/mF_YSlider.js" type="text/javascript"></script>
<link href="js/mf-pattern/mF_YSlider.css" rel="stylesheet" type="text/css" />

</head>

<body>
	<div class="top">
    	<div class="top_content">
        	<ul>
            	<li><a href="#">联系我们</a></li>
                <li><a href="#" onclick="AddFavorite(window.location,document.title)">加入收藏</a></li>
            	<li><a href="#" onclick="setHome(window.location)">设为首页</a> </li>
            </ul>
        </div>
    </div><!-- top结束 -->
    
	<div class="wrap">
    	<div class="logo">
        	<div class="logo_left">
            	<img src="images/logo.jpg" alt="慕课网"/>
            </div>
            <div class="logo_right">
            	<img src="images/tel.jpg" alt="服务热线"/>24小时服务热线:<span class="tel">123-456-7890</span>
            </div>
        </div><!--logo结束-->
        <div class="nav">
        	<div class="nav_left"></div>
            <div class="nav_middle">
            	<div class="nav_middle_left">
                	<ul>
                    	<li><a href="#">首页</a></li>
                        <li><a href="list.html">关于慕课</a></li>
                        <li><a href="list.html">课程中心</a></li>
                        <li><a href="list.html">在线课程</a></li>
                        <li><a href="list.html">人才招聘</a></li>
                    </ul>
                </div>
                <div class="nav_middle_right">
                	<form action="" method="post">
                    	<input type="text" class="search_text"/>
                    </form>
                </div><!--nav_middle结束-->
            </div>
            <div class="nav_right"></div><!--nav结束-->
        </div>
        <div class="ad">
        	<ul>
                <li><img src="images/ad2.jpg" /></li>
                <li><img src="images/ad3.jpg" /></li>
                <li><img src="images/ad4.jpg" /></li>
            </ul>
        </div>
    </div><!--wrap结束-->
</body>

<!----- css ------>
@charset "utf-8";
/* CSS Document */
*{
	margin:0;
	pading:0;
	font-size:12px;
}

body{
	background-color:#F5F5F5;
}

.top{
	width:100%;
	height:27px;
	background:url(../images/top_bg.jpg) repeat-x;
}

.top_content{
	width:1000px;
	margin:0 auto;
	line-height:27px;
}

.top_content li{
	list-style-image:url(../images/li_bg.gif);
	float:right;
	width:70px;
	line-height:27px;
}

.top_content a:link,.top_content a:visited{
	color:#8E8E8E;
	text-decoration:none;
}

.top_content a:hover,.top_content a:active{
	color:#F00;
	text-decoration:none;
}

.wrap{
	width:1000px;
	margin:0 auto;
}

.logo{
	height:80px;
	background-color:#FFF;
}

.logo_left{
	width:200px;
	float:left;
}

.logo_right{
	width:300px;
	float:right;
	height:28px;
	margin-top:30px;
	color:#8E8E8E;
}

.logo_right img{
	vertical-align:middle;
	margin-right:10px;
}

.tel{
	font-family:"微软雅黑";
	font-size:16px;
	color:#F00;
}

.nav{
	height:40px;
}

.nav_left{
	width:10px;
	background:url(../images/nav_left.jpg) no-repeat;
}

.nav_middle{
	width:980px;
	background:url(../images/nav_bg.jpg) repeat-x;
	line-height:40px;
}

.nav_right{
	width:10px;
	background:url(../images/nav_right.jpg) no-repeat;
}
.nav_left,.nav_middle,.nav_right{
	float:left;
	height:40px;
	display:inline;
}

.nav_middle_left,.nav_middle_right{
	float:left;
}

.nav_middle_left{
	width:680px;
}

.nav_middle_right{
	width:300px;
}

.nav_middle_left li{
	float:left;
	list-style-type:none;
	width:100px;
	text-align:center;
	line-height:40px;
}

.nav_middle_left a:link,.nav_middle_left a:visited{
	text-decoration:none;
	color:#FFF;
	font-size:16px;
	font-family:"微软雅黑";
}

.nav_middle_left a:hover,.nav_middle_left a:active{
	text-decoration:none;
	color:#FF0;
	font-size:16px;
	font-family:"微软雅黑";
}

.search_text{
	width:190px;
	height:25px;
	margin-top:5px;
	background:url(../images/search.jpg) no-repeat right center;
	/*background-image:url(../images/search.jpg);
	background-repeat:no-repeat;
	background-position:right center;*/
	background-color:#FFF;
	padding-right:25px;
	border:1px solid #FFF;
}

.ad{
	height:310px;
	width:900px;
	background-color:#0F6;
}
.ad li{
	margin:0;
	list-style-type:none;
	align:center;
}