Chaining select lists

Hi,

I try to create two dynamic  depending  selectlists whereas the second select list depends on the choose of the first list.

Both lists are populated by a database query.

Here is a simple example:

First list: Usergroups

<cfselect name="usergroups" >

<cflloop query="select_usergroup">

<option value="id">#usergroup_name#

</cfselect>

Second list: Users

<cfselect name="users" >

<cflloop query="select_user">

<option value="id">#user_name#

</cfselect>

When selecting a usergroup in  the first list, the query of the second list runs in dependence of the value of first list.

Is there a possibility to solve this problem without using Url-parameter? I have a big formular with many form-fields and I assume that this method is not very fast.

I also try to use data binding, but then I have a problem preselecting values in the lists.

Environment: Oracle 11g, ColdFusion 9 Standard

Any idea?

regards Claudia