以下是引用片段：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>经典实用的触发型导航菜单</title>
</head>
<body>
<STYLE type=text/css>.sec1 {
BORDER-RIGHT: gray 1px solid; BORDER-TOP:
#ffffff 1px solid; BORDER-LEFT: #ffffff 1px
solid; CURSOR: hand; COLOR: #000000; BORDER-
BOTTOM: #ffffff 1px solid; BACKGROUND-COLOR:
#eeeeee
}
.sec2 {
BORDER-RIGHT: gray 1px solid; BORDER-TOP:
#ffffff 1px solid; FONT-WEIGHT: bold; BORDER-
LEFT: #ffffff 1px solid; CURSOR: hand; COLOR:
#000000; BACKGROUND-COLOR: #d4d0c8
}
.main_tab {
BORDER-RIGHT: gray 1px solid; BORDER-
LEFT: #ffffff 1px solid; COLOR: #000000; BORDER-
BOTTOM: gray 1px solid; BACKGROUND-COLOR: #d4d0c8
}
</STYLE>
<!--JavaScript部分-->
<SCRIPT language=javascript>
function secBoard(n)
{
for(i=0;i<secTable.cells.length;i++)
secTable.cells
[i].className="sec1";
secTable.cells[n].className="sec2";
for(i=0;i<mainTable.tBodies.length;i++)
mainTable.tBodies
[i].style.display="none";
mainTable.tBodies
[n].style.display="block";
}
</SCRIPT>
<!--HTML部分-->
<TABLE id=secTable cellSpacing=0 cellPadding=0 width=549 border=0>
<TBODY>
<TR align=middle height=20>
<TD class=sec2 onclick=secBoard(0) width="10%">网页学习</TD>
<TD class=sec1 onclick=secBoard(1) width="10%">平面学习</TD>
<TD class=sec1 onclick=secBoard(2) width="10%">DIV+CSS学习</TD>
<TD class=sec1 onclick=secBoard(3) width="10%">HTMl学习</TD>
</TR></TBODY></TABLE>
<TABLE class=main_tab id=mainTable height=240 cellSpacing=0 cellPadding=0 width=549 border=0><!--关于TBODY标记-->
<TBODY style="DISPLAY: block">
<TR>
<TD vAlign=top align=middle><BR><BR>
<TABLE cellSpacing=0 cellPadding=0 width=490 border=0>
<TBODY>
<TR>
<TD>网页学习<BR></TD></TR></TB
ODY></TABLE></TD></TR></T
BODY><!--关于cells集合-->
<TBODY style="DISPLAY:
none">
<TR>
<TD vAlign=top
align=middle><BR><BR>
<TABLE cellSpacing=0
cellPadding=0 width=490 border=0>
<TBODY>
<TR>
<TD>平面学习<BR></TD></TR></TB
ODY></TABLE></TD></TR></T
BODY><!--关于tBodies集合-->
<TBODY style="DISPLAY:
none">
<TR>
<TD vAlign=top
align=middle><BR><BR>
<TABLE cellSpacing=0
cellPadding=0 width=490 border=0>
<TBODY>
<TR>
<TD><span class="sec1">DIV+CSS学习</span><BR></TD></TR></TB
ODY></TABLE></TD></TR></T
BODY><!--关于display属性-->
<TBODY style="DISPLAY:
none">
<TR>
<TD vAlign=top
align=middle><BR><BR>
<TABLE cellSpacing=0
cellPadding=0 width=490 border=0>
<TBODY>
<TR>
<TD><span class="sec1">HTMl学习</span></TD>
</TR></TBODY></TABLE>
;</TD></TR></TBODY></TABLE>
</body>
</html>
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