如何制作关联的下拉菜单？

<%

OpenDB objConn, "xxxx"

Set RSClass = objConn.Execute("select * from class Order by fldClass")

If RSClass.EOF Then

Response.Write "噢,没有记录!
"

Else

Response.Write "

" ONCHANGE=""classselected(this);"" >"

sjavascript = "function classselected(elem){" &_

vbCrlf

"for (var i = document.f1.sort.options.length; i >= 0; i--){" 

"document.f1.sort.options[i] = null;" 

vbCrlf

Do Until RSClass.EOF

If sLastClass <> RSClass("fldClass") Then

sLastClass = RSClass("fldClass")

Response.Write "" & sLastClass & ""

sjavascript = sjavascript & "}" 

"if (elem.options[elem.selectedIndex].value=="

RSClass("fldID") & "){"

End If

sjavascript = sjavascript

"document.f1.sort.options[document."

"f1.sort.options.length] = new Option('"

RSClass("fldSort") & "','" & RSClass("fldID") & "');"

vbCrlf

RSClass.MoveNext

Loop

 

Response.Write "

"

Response.Write ""

Response.Write "请选择"

Response.Write "

"

　

sjavascript = sjavascript  & "}"  & "}"

 

Response.Write ""

Response.Write sjavascript  & ""

 

End If

RSClass.Close

Set RSClass = Nothing

%>