body { 
margin:0;
background-color: #FFFFFF; 
}	
.STYLE1 {
	font-family: "MS Mincho";
	font-size: 13px;
	font-style: normal;
	line-height: 18px;
	font-weight: bold;
	font-variant: normal;
	color: #000000;
}
.STYLE2 {
	font-family: "MS Mincho", "宋体";
	font-size: 12px;
	font-style: normal;
	line-height: 18px;
	font-weight: normal;
	font-variant: normal;
	color: #333333;
}
.STYLE3 {
	font-size: 15px;
	font-family: "黑体";
	font-style: normal;
	line-height: normal;
	font-weight: bold;
	font-variant: normal;
	color: #000000;
}
.STYLE4 {
	color: #333333;
	font-family: "宋体";
	font-size: 13px;
	font-style: normal;
	line-height: 14px;
	font-weight: normal;
}
.h1 {
	font-family: Arial, Helvetica, sans-serif, "黑体";
	font-size: 13px;
	font-style: normal;
	line-height: normal;
	font-weight: bold;
	font-variant: normal;
	color: #666666;
}
.h2 {
	font-family: "宋体";
	font-size: 13px;
	font-style: normal;
	line-height: 18px;
	font-weight: normal;
	font-variant: normal;
	color: #666666;
}
.h3 {
	color: #000000;
	font-family: "黑体";
	font-size: 16px;
	font-style: italic;
	line-height: normal;
	font-weight: normal;
}

onclick="change(this.id)"
<script>
function change(id)
{
document.getElementById(id).style.display=none;
}
</script>


<script language="javascript" >
 function chgtt(i)
 {
    if(i==1)
 {
   book1.style.display="";
   book2.style.display="none";
   book3.style.display="none";
 }
 else
 if(i==2)
 {
   book1.style.display="none";
   book2.style.display="";
   book3.style.display="none";
 }
 else
 if(i==3)
 {
   book1.style.display="none";
   book2.style.display="none";
   book3.style.display="";
 }
 
h4 {
	font-family: "黑体";
	font-size: 16px;
	line-height: normal;
	font-weight: normal;
	color: #000000;
}