CS5 drop down menu script errors

Question

Hello,
I'm fairly new to flash and actionscript 3. I've started working on a drop down menu and I keep running into the following errors.
1120: Access of undefined property  Moiveclip.
1118: Implicit coercion of a value with static type Object to a possibly unrelated type flash.display:DisplayObject.
Both compiler errors point to this line of code - navBar_mc.setChildIndex(event.target as  Moiveclip, 1);
Actoinscripting:
import flash.filters.GlowFilter;
import flash.events.MouseEvent; var navBtnGlow:GlowFilter = new GlowFilter (0x999999, 0.5, 0, 15, 1, 2, true, false);
navBar_mc.addEventListener(MouseEvent.MOUSE_OVER, navOverF);
navBar_mc.addEventListener(MouseEvent.MOUSE_OUT, navOutF); function navOverF(event:MouseEvent):void{
    event.target.filters = [navBtnGlow];
navBar_mc.setChildIndex(event.target as Moiveclip, 1);
dropMenus_mc.gotoAndStop(navBar_mc.getChildAt(1).name); }
function navOutF(event:MouseEvent):void{
    event.target.filters = [];
any suggestions..?
I've also included a link the fla file.
-Jason
fla file:
http://www.photorexit.com/menu.zip

Answer 1

Jesse,
Thanks for the post and reply.
I changed the line of code you suggested  - dropMenus_mc.gotoAndStop(navBar_mc.getChildAt(0).name);
Unfortunaltely I still receive the following report when I rollover the menu button. The menu doesn't drop down either.
RangeError: Error #2006: The supplied index is out of bounds.
    at flash.display::DisplayObjectContainer/setChildIndex()
    at menu_fla::MainTimeline/navOverF()
Im not quite sure whats going on with it....?
At this point im pretty clueless.
If you have any other suggestions, I'm all ears
-Jason