<body>
<div id="container">
<div id="head">
<div id="top"> </div>
<div class="menu"></div>
<div class="menu">学院首页</div>
<div class="menu">学校概况</div>
<div class="menu">组织机构</div>
<div class="menu">专业设置</div>
<div class="menu">教育教学</div>
<div class="menu">招生就业</div>
<div class="menu">科学研究</div>
<div class="menu">合作交流</div>
</div>
<div id="main">
<div class="lside"></div>
<div class="mside"></div>
<div class="rside"></div>
</div>
<div id="foot"></div>
</div>
</body>
*{
margin:0px;
}
#container {
background-color: #999999;
900px;
height:800px;
margin-left:auto;
margin-right:auto
}
#head{
background-color:#CCCCCC;
900px;
height:120px;
margin-left:auto;
margin-right:auto
}
#top{
background-color:#00FF66;
900px;
height:100px;
margin-left:auto;
margin-right:auto
}
.menu{
background-color:#FF0000;
100px;
height:20px;
float:left
}
#main{
background-color:#9999CC;
900px;
height:600px;
margin-left:auto;
margin-right:auto
}
.lside{
background-color:#0000FF;
250px;
height:600px;
float:left
}
.mside{
background-color:#FF00FF;
400px;
height:600px;
float:left
}
.rside{
background-color:#FFFF00;
250px;
height:600px;
float:left
}
#foot{
background-color:#333366;
900px;
height:80px;
margin-left:auto;
margin-right:auto
}
<body>
<div id="container">
<div id="head">
<div id="top">
<img src="img.jpg.png"900px; height:100px;/>
</div>
<div class="menu"></div>
<div class="menu">学院首页</div>
<div class="menu">学校概况</div>
<div class="menu">组织机构</div>
<div class="menu">专业设置</div>
<div class="menu">教育教学</div>
<div class="menu">招生就业</div>
<div class="menu">科学研究</div>
<div class="menu">合作交流</div>
</div>
<div id="main">
<div class="lside"></div>
<div class="mside"></div>
<div class="rside"></div>
</div>
<div id="foot"></div>
</div>
</body>