Shop w/ images using loadMovie

So I have a shop code I’m working on and right now I have two problems/questions…
One: I’m trying to show an inventory in images. I already have an image loaded with an array and loadMovie, so getting it from a URL, that’s a preview of each item… However, I’m not sure how to control a movie clip with a variable instance name, so how would I do that? (right now you can find it in the code with an instance name of “you”);
Two: When I add an image to the inventory, no more preview images show.
Here is my code:

this.createEmptyMovieClip("itempic_mc",this.getNextHighestDepth());
var shopItems:Array = new Array(["Tie", "Appropriate for the office. One size fits all.", 120, "http://www.bowwowsbest.com/v/vspfiles/photos/DDS-BNTCS-092007-TIE-0.jpg"], ["Bling", "Yeeaaah", 400, "http://tbn8-beta.google.com/images?q=tbn:48RnJkoFUF6fuM:http://psworkshop.net/psworkshop/UserImages/andrei/bling_50.gif"], ["Bag", "Of course it's not a ripoff. The shady dealer told me so!", 600, "http://tbn6-beta.google.com/images?q=tbn:0qD5MiQxuey3TM:http://pursetrends.info/images/pradahandbag2.gif"]);
var n:Number = 0;
var money:Number = 500;
var inventory:Array = new Array();
var viewinventory:Array = new Array();
function iteminfo() {
    item.text = shopItems[n][0]+"    "+shopItems[n][2];
    itemdes.text = shopItems[n][1];
    itempic_mc.clear();
    itempic_mc._x = itemdes._x+itemdes._width+20;
    itempic_mc._y = itemdes._y;
    itempic_mc.loadMovie(shopItems[n][3]);

}
iteminfo();
rightarrow.onRelease = function() {
    if (n<shopItems.length-1) {
        n++;
        iteminfo();
    }
};
leftarrow.onRelease = function() {
    if (n>0) {
        n--;
        iteminfo();
    }
};
buy.onRelease = function(){
    money -= shopItems[n][2];
    inventory.push([shopItems[n][0]],[n]);
    viewinventory.push(shopItems[n][0]);
    inven_txt.text = viewinventory;
    _root.createEmptyMovieClip("you",this.getNextHighestDepth());
    you.loadMovie(shopItems[n][3]);
    you._x = inven_txt._x;
    you._y = inven_txt._y + 20 + 50 * (viewinventory.length-1);
    
}

The stage is just set up with some text fields and buttons. (There is a money text field you don’t find in the code with the variable set to money).