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如何实现象Windows98帮助中的如像诊断故障一样的一步步的网页，
即如何实现根据不同单选来进入不同下一步？
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=unicode">
<META content="MSHTML 6.00.2800.1170" name=GENERATOR></HEAD>
<BODY>
<P><INPUT type=radio onclick="aa(1)">sina</P>
<P><INPUT type=radio onclick="aa(2)">yahoo</P>
<P><INPUT type=radio onclick="aa(3)">sohu</P></BODY></HTML>
<SCRIPT LANGUAGE=javascript>
<!--
function aa(i)
{
var ary = new Array();
ary[0] = "http://www.sohu.com";
ary[1] = "http://www.sina.com.cn";
ary[2] = "http://www.yahoo.com.cn";
window.location = ary[i-1];
}
//-->
</SCRIPT>
<input type=radio onclick="window.location.href=a.htm">a.htm<br>
<input type=radio onclick="window.location.href=b.htm">b.htm<br>
<input type=radio onclick="window.location.href=c.htm">c.htm<br>
<input type=radio onclick="window.location.href=d.htm">d.htm<br>
