#top_area {
	
	width: 780px;
	margin-left:auto;
	margin-right:auto;
	text-align:center
}

#nav{
margin:0;
padding:0;
height:54px;
background:url(nav_bg_02.gif);
font-family:"黑体";
}
#nav ul{
list-style:none;
margin:0;
padding:0;
}
#nav li{
float:left;
margin-top:2px;
width:110px;
background:url(temp_nav_bg.gif);
}
#nav li a{
display:block;
height:24px;
line-height:44px;
text-decoration:none;
color:#626262;
}
#nav li a:hover{
color:#FF0000;
}
#banner{
    margin-left:auto;
	margin-right:auto;
	text-align:center;
}
<!--
/*以下为整个主区域*/
#main_area {
margin-left:auto;
margin-right:auto;
text-align:center;
width:780px;
font-size:11pt;
}
/*以下为整个主区域背景信息，解决firefox中无法展示背景*/
#main_area_bg{
background:#FFFFFF;
float:left;
}
/*以下为主内容区域*/
#content_area{
float:right;
width:545px;
text-align:left;
border-left:1px solid #CCCCCC;
padding-left:10px;
padding-right:10px;
}
#content_area p{
text-indent:23px;
letter-spacing:1px;
line-height:18px;
}
#left_area {
	width:180px;
	text-align:left;
	float:left;
	background-color:#FFFFFF;
	height:620px;
}
#left_area ul{
list-style:url(../images/biao.gif);
margin-top:10px;
margin-left:15px;
padding:0;
}
#left_area li{
border-bottom:1px solid #CCCCCC;
height:30px;
line-height:30px;
margin-left:20px;
padding-left:5px;
}
#left_area li a{
display:block;
width:120px;
font-size:10pt;
}
#left_contact{
float:left;
width:170px;
height:200px;
background-color:#FFFFFF;
font-size:10pt;
line-height:15pt;
}
#left_contact dl{
margin:0;
margin-left:10px;
padding:0;
}
#left_contact dl dt{
font-weight:bold;
}
#left_contact dd{
margin:0px;
margin-left:15px;
}
#foot{
margin-left:auto;
margin-right:auto;
padding-top:5px;
width:780px;
background-color:#999999;
text-align:center;
font-size:10pt;
color:#00791C;
clear:both;
line-height:15pt;
}
#foot a{
color:#666666;
}
#foot a:hover{
color:#FF0000;
}
#foot img{
padding-left:150px;
}