Javascript Implementation dropdown list, hint: Array not defined

There is an application that requires a drop down list (class1) change to trigger the change of another dependency list (Class2). In reference to the dropdown box (database version), there are the following pieces of the program:
<% sql = "SELECT ID, Name, substring (id,1,2) Bigclass from Classone where type= ' 1 ' ORDER by ID"
Set rs = Session ("conn"). Execute (SQL)
%>
<script language= "JavaScript" >
var onecount = 0;
subcat = new Array (); <---------tip: Array not defined------------
<% count = 0
Do, not rs.eof <---------RS is already a previously defined recordset
%>
Subcat[<%=count%>] = new Array ("<%=trim (RS (" name))%> "," <%=trim (RS ("Bigclass"))%> "," <%=trim ( RS ("id"))%> ");
<% count = count+1
Rs.movenext
Loop
Rs.close
Set rs = Nothing
%>
Onecount = <%=count%>
function Chgcls () {
for (var i=document.search.class2.options.length; i>0; i--) {
Document.search.class2.options[i]=null;
}
for (i = 0; i<onecount; i++) {
Bigclass = "'" &subcat[i][1]& "";
if (Document.search.class1.options[document.search.class1.selectedindex].value==bigclass) {