cfslider not generating form value

Using CFSLIDER in a simple form.

When I submit the page to the event.cfm handler, I am not presented with any form values. Esp. not rsvp_changer. Added preservedata, no good.  What am I missing?

<cfform name="notify" method="post" preservedata="Yes">

<cfslider 

    name = "rsvp_changer"

    clickToChange = "true"

    format = "html"

    increment = "1"

    max = "2"

    min = "0"

    tip = "false"

    value = "1"

    vertical = "false"

    width = "400">

<cfinput name="slider" type="button" value=" Save " class="pf" onClick="notifySaveIt(this.form)">

<cfoutput><script language="javascript">

           function notifySaveIt(form){

                                             form.action='event.cfm?event_id=#url.event_id#&notifyu pdate=';

                                             form.submit();

                         }

</script></cfoutput>