Help with back and next buttons in as3 xml classes

i’m including my code here…in addition to the buttons, i need to figure out how to reset properties inside of a display object - inside Thumbnail.as: i need to have a box (and it’s related assets) reset the x properties so that the thumbs don’t fall off the right side of my layout. i’m handling putting the thumb_mcs on the screen in the main as file.

any help would be appreciated…i’m especially flummoxed on how to get the buttons to work.

here’s my main document class:

package {
    import flash.display.Sprite;
    import flash.display.MovieClip;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.display.Loader;
    import flash.display.*;
    import flash.events.*;
    import flash.net.URLRequest;
    import flash.net.URLLoader;

    public class Main extends Sprite {

        private var imagesXML:XML;
        private var counter:uint;
        private var thumbs:Array = new Array();
        private var thumb_mc:Sprite;
        private var contents_mc:Sprite;
        private var prevBtn:PrevBTN;
        private var nextBtn:NextBTN;
        private var currevent:Thumbnail;
        private var activityid:Thumbnail;
        private var activity:Thumbnail;
        private var stroke:Shape;
        private var eventNum:Number;
        private var totalEvents:Number;
        private var xmlList:XMLList;
        private var eventDetail:CalendarEvent = new CalendarEvent();


        public function Main() {

            var url:URLRequest=new URLRequest("data.xml");
            var urlLoader:URLLoader = new URLLoader();
            urlLoader.addEventListener(Event.COMPLETE, urlLoadCompleteHandler);
            urlLoader.load(url);

        }

        public function urlLoadCompleteHandler(e:Event):void {
            imagesXML=new XML(e.target.data);
            displayAllImages(imagesXML);

            xmlList=imagesXML.children();
            var totalEvents:Number=xmlList.length();
            var eventNum:Number=0;

            trace(totalEvents + " total events");

        }

        public function displayAllImages(xml:XML):void {

            var eventid:XMLList=xml.activity.eventid;
            var currentevent:XMLList=xml.activity.currentevent;
            var date:XMLList=xml.activity.date;
            var title:XMLList=xml.activity.title;
            var image:XMLList=xml.activity.image;
            var thumb:XMLList=xml.activity.thumb;
            var credit:XMLList=xml.activity.credit;
            var caption:XMLList=xml.activity.caption;
            var blurb:XMLList=xml.activity.blurb;

            var totalEvents:Number=xml.length() - 1;
            var eventNum:Number=0;
                
                var nextBtn:MovieClip = new NextBTN();
                nextBtn.x = 513;
                nextBtn.y = 190;
                //nextBtn = eventid.length();
                nextBtn.buttonMode=true;
                nextBtn.mouseChildren=false;
                nextBtn.addEventListener(MouseEvent.CLICK, onNextSlide, false, 0, true);
                addChild(nextBtn);
                
                var prevBtn:MovieClip = new PrevBTN();                
                prevBtn.x = 370;
                prevBtn.y = 190;
                //prevBtn = eventid.length();
                prevBtn.buttonMode=true;
                prevBtn.mouseChildren=false;
                prevBtn.addEventListener(MouseEvent.CLICK, onPrevSlide, false, 0, true);
                addChild(prevBtn);

            eventDetail.x=2;
            eventDetail.y=240;

            addChild(eventDetail);


            for (var j:uint = 0; j<thumb.length(); j++) {

                displayThumb(thumb[j], title[j], date[j], eventid[j], currentevent[j], image[j], blurb[j], credit[j], caption[j]);

            }

            displayEvent(currevent);
            //displayEvent(activityid);

        }

        public function displayEvent(activity:Thumbnail):void {

            eventDetail.loadEvent(activity);


        }


        public function displayThumb(thumb:String, title:String, date:String, activityid:String, currentevent:String, image:String, blurb:String, credit:String, caption:String):void {

            var stroke:Shape = new Shape();
            stroke.graphics.lineStyle(5, 0xFFCC66, 1, true, "none", null, JointStyle.MITER, 3);
            stroke.graphics.drawRect(6, 2, 71, 71);

            var thumb_mc:Thumbnail=new Thumbnail(thumb,title,date);


            if (currentevent=="true") {

                currevent=thumb_mc;

                thumb_mc.addChild(stroke);
                stroke.visible=true;
                
                trace(activityid + " currevent");
                
            }

            thumb_mc.x=counter*86;
            thumb_mc.y=10;
            
            thumb_mc.name = "thumb";

            thumbs.push();
            thumb_mc.addEventListener(MouseEvent.MOUSE_UP, clickOnThumb, false, 0, true);

            if (thumb_mc.x>=stage.stageWidth-5) {

                thumb_mc.x=thumb_mc.x-thumb_mc.width-346;
                thumb_mc.y=thumb_mc.height+10;

            }

            addChild(thumb_mc);

            thumb_mc.activityid=activityid;
            thumb_mc.activitythumb=thumb;
            thumb_mc.activitytitle=title;
            thumb_mc.activitydate=date;
            thumb_mc.activityimage=image;
            thumb_mc.activitycredit=credit;
            thumb_mc.activitycaption=caption;
            thumb_mc.activityblurb=blurb;

            counter++;
        }
    
    
    public function onNextSlide(e:MouseEvent):void {
        
        if (eventNum >= totalEvents) { 
        
        eventNum = 0; 
        
        } else {
        
        eventNum++;
        
        }
    }

    public function onPrevSlide(e:MouseEvent):void {
    
        if (eventNum <= 0) {
            
        eventNum = totalEvents + 1;
        
        }
        
        eventNum--;

    }
    
    public function clickOnThumb(e:MouseEvent):void {
        
        displayEvent(e.target as Thumbnail);
                
        }
    }
}