20.asp
<% @ language="vbscript"%>
<html>
<head>
<title>name</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<%
dim tom
tom=request.form("abc")
if tom="a" then
response.redirect"a.htm"
end if
if tom="b" then
response.redirect"b.htm"
end if
if tom="c" then
response.redirect"c.htm"
end if
%>
</body>
</html>