Xml drop down menu

[kobalt7]

im trying to create a dropdown menu with submenus and thumbnails but im not quite sure how to pull it off, i got the basic dropdown working but i cant figure out how to implement the submenu within or get the thumbnails to load correctly

#include "mc_tween2.as"
function loadXML(loaded) {
    if (loaded) {
        xmlNode = this.firstChild;
        image = [];
        description = [];
        thumbnails = [];
        sections = [];
        sub = [];
        subimage = [];
        subdesc = [];
        subthumb = [];
        subsec = [];
        subtotal = [];
        total = xmlNode.childNodes.length;
        for (i=0; i<total; i++) {
            image* = xmlNode.childNodes*.childNodes[0].firstChild.nodeValue;
            description* = xmlNode.childNodes*.childNodes[1].firstChild.nodeValue;
            thumbnails* = xmlNode.childNodes*.childNodes[2].firstChild.nodeValue;
            sub* = xmlNode.childNodes*.childNodes[4].firstChild.nodeValue;
            subtotal* = xmlNode.childNodes*.childNodes[5].childNodes.length;
            xmlnode2 = xmlNode.childNodes*.childNodes[5].firstChild;
            if (sub* == "true") {
                for (h=0; h<subtotal*; h++) {
                    subsec[h] = xmlnode2.childNodes[0].firstChild.nodeValue;
                    subimage[h] = xmlnode2.childNodes[0].firstChild.nodeValue;
                    subdesc[h] = xmlnode2.childNodes[1].firstChild.nodeValue;
                    subthumb[h] = xmlnode2.childNodes[2].firstChild.nodeValue;
                }
            } else {
                //trace("nosub");
            }
            mnu(i);
            
        }
        //firstImage();
    } else {
        content = "file not loaded!";
    }
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("menusystem.xml");
aa = 0;
///////////////////////////////////// 
function mnu(k) {
    var menuvar = holder.attachMovie("menu_mc", "menu_mc"+k, ++aa);
    menuvar.cap.m_caption.text = description[k];
    menuvar._alpha = 0;
    menuvar.msk._xscale = 1;
    menuvar.cap.setMask(menuvar.msk);
    var menut = Math.round((menuvar._height)*k);
    menuvar._y = 0;
    menuvar.tween("_alpha", 100, .2, "easeOutExpo", k/total);
    menuvar.tween("_y", menut, .3, "easeOutExpo", k/total);
    menuvar.msk.tween("_xscale", 100, 1, "easeOutExpo", k/total+.2);
    menuvar.bk._alpha = 60;
    var xvar = menuvar.cap._x;
    var xvaru = menuvar.cap._x+5;
    menuvar.onRollOver = function() {
        this.bk.glowTo(0xFF7300, 1, 10, 2, 2, false, false, 2);
        this.bk._alpha = 100;
        this.bk.colorTo(0xFF7300, 0.5, "linear");
        this.cap.colorTo(0x000000, 0.5, "linear");
        this.swapDepths(1111);
        this.streek.play();
        this.cap.tween("_x", xvaru, 1, "easeOutExpo");
        if (sub[k] == "true") {
            tum(k);
            target_mc._alpha = 100;
            trace("submenu");
            
        }
    };
    menuvar.onRollOut = function() {
        //if (_parent.hitTest(this)) {
        this.t[k].tween("_alpha", 0, 1, "easeOutExpo", k/total, function () {
            target_mc._alpha = 0;
            this.removeMovieClip;
        });
        this.bk.colorTo(0x000000, 0.5, "linear");
        this.cap.colorTo(0xFFFFFF, 0.5, "linear");
        this.bk.glowTo(0xFF7300, 0, 0, 0, 0, false, false, 0);
        this.bk._alpha = 60;
        this.streek.gotoAndStop(1);
        this.cap.tween("_x", xvar, 1, "easeOutExpo");
        //} else {
        //}
    };
    aa++;
}

function tum(k) {
    holder.createEmptyMovieClip("t"+k, holder.getNextHighestDepth());
    tlistener = new Object();
    tlistener.onLoadInit = function(target_mc) {
        target_mc.glowTo(0xFF7300, 1, 5, 200, 2, true, false, 2);
        target_mc._y = (40+5)*k;
        target_mc._x = 135;
        //trace(target_mc._width+" "+target_mc._parent._rotation)
        target_mc.pictureValue = k;
        //target_mc._alpha = 0;
    };
    image_mcl = new MovieClipLoader();
    image_mcl.addListener(tlistener);
    image_mcl.loadClip(thumbnails[k], "holder.t"+k);
}

heres the xml

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<menu>
    <pic>
        <image>kresge.jpg</image>
        <caption>Section 1</caption>
        <thumbnail>kresge_sm.jpg</thumbnail>
        <link>section</link>
        <extended>true</extended>
        <sub>
            <pic>
                     <image>kresge.jpg</image>
                  <caption>Section 1</caption>
                  <thumbnail>kresge_sm.jpg</thumbnail>
                <link>section1</link>
                <desc>section1 is fantastic</desc>
            </pic>
            <pic>
                     <image>kresge.jpg</image>
                  <caption>Section 1</caption>
                  <thumbnail>kresge_sm.jpg</thumbnail>
                <link>section1</link>
                <desc>section1 is fantastic</desc>
            </pic>
        </sub>

    
    </pic>
    <pic>
        <image>medialab.jpg</image>
        <caption>Media Lab</caption>
        <thumbnail>medialab_sm.jpg</thumbnail>
        <link>http://www.media.mit.edu/</link>
        <extended>false</extended>
    </pic>
    <pic>
        <image>stata.jpg</image>
        <caption>Stata Center</caption>
        <thumbnail>stata_sm.jpg</thumbnail>
        <link>http://web.mit.edu/evolving/projects/kresge/</link>
        <extended>false</extended>
    </pic>
    <pic>
        <image>stata_lobby.jpg</image>
        <caption>Stata Lobby</caption>
        <thumbnail>stata_lobby_sm.jpg</thumbnail>
        <link>http://www.eecs.mit.edu/stata-link.html</link>
        <extended>false</extended>
    </pic> 

</menu>