AS 2.0 Scrolling Menu Disappears - Please Help

I have a portfolio gallery on my website at:
http://www.abbiecrumrine.net
On my portfolio page I have a scrolling menu. Everything works fine until I click on another window. When I go back to the window with my portfolio site, the scrolling menu disappears. Below is the code for the menu. Any ideas why this might be happening?

Thank you.

Code:

---

stop();

function loadXML(loaded) {
        if (loaded) {
                xmlNode = this.firstChild;
                image = [];
                description = [];
                intro = [];
                total = xmlNode.childNodes.length;
                for (i=0; i<total; i++) {
                        image[i] = xmlNode.childNodes[i].childNodes[0].firstChild.nodeValue;
                        description[i] = xmlNode.childNodes[i].childNodes[1].firstChild.nodeValue;
                        intro[i] = xmlNode.childNodes[i].childNodes[2].firstChild.nodeValue;
                }
                portIntro();
        } else {
                content = "file not loaded!";
        }
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("images.xml");
/////////////////////////////////////

menu1.onRelease = function() {
if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[1], 1);
                        desc_txt.text = description[1];
                        intro_txt.text = intro[null];
}
};
menu2.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[2], 1);
                        desc_txt.text = description[2];
                        intro_txt.text = intro[null];
        }
};
menu3.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[3], 1);
                        desc_txt.text = description[3];
                        intro_txt.text = intro[null];
        }
};
menu4.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[4], 1);
                        desc_txt.text = description[4];
                        intro_txt.text = intro[null];
        }
};
menu5.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[5], 1);
                        desc_txt.text = description[5];
                        intro_txt.text = intro[null];
        }
};
menu6.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[6], 1);
                        desc_txt.text = description[6];
                        intro_txt.text = intro[null];
        }
};
menu7.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[7], 1);
                        desc_txt.text = description[7];
                        intro_txt.text = intro[null];
        }
};
menu8.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[8], 1);
                        desc_txt.text = description[8];
                        intro_txt.text = intro[null];
        }
};
menu9.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[9], 1);
                        desc_txt.text = description[9];
                        intro_txt.text = intro[null];
        }
};
menu10.onRelease = function() {
        if (loaded == filesize) {
                        picture._alpha = 0;
                        picture.loadMovie(image[10], 1);
                        desc_txt.text = description[10];
                        intro_txt.text = intro[null];
        }
};
/////////////////////////////////////

this.onEnterFrame = function() {
        currentMousex = Math.floor(this._xmouse)-75;
        if(maxSpeed != false) currentMousex = (currentMousex >= maxSpeed)? maxSpeed : -maxSpeed;
       
        //-----------------------------------------
        if(!holdPosition){
                for(j=0;j <= totalClips; j++){
                        var tmpObj = this[clipBaseName + j];
                        tmpObj._x = Math.floor(tmpObj._x-(currentMousex*slideSpeed));
                        if(tmpObj._x <= maxleft){tmpObj._x += totalWidth;}
                        if(tmpObj._x >= maxright){tmpObj._x -= totalWidth;}
                }
        }
        filesize = picture.getBytesTotal();
        loaded = picture.getBytesLoaded();
        preloader2._visible = true;
        if (loaded != filesize) {
                preloader2.preload_bar2._xscale = 100*loaded/filesize;
        } else {
                preloader2._visible = false;
                if (picture._alpha<100) {
                        picture._alpha += 10;
                }
        }
};


function portIntro() {
                desc_txt.text = description[null];
                intro_txt.text = intro[0];
}





//Setup////////////////////////////////////////

//totalclips on stage - make sure in the properties panel they are named imgbox1,imgbox2,imgbox3,etc...
var totalClips = 10;                       

//to stop the clips from moving change to true;
var holdPosition = false;

//applies a max speed for the movie clips (false if no max speed)
var maxSpeed = false;

///////////////////////////////////////////////////


//Defaults
var slideSpeed                = 0.05;
var currentMousex        = 0;
var clipBaseName        = 'menu';
var w_clips                = this[clipBaseName + '1']._width+2;
var totalWidth                = (totalClips * w_clips);
var maxleft                = (menu1._x)+75;
var maxright                = (totalWidth/2)+75;
//--

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