Xml drop down menu

I’m trying to create a drop down menu similar to this
http://www.kirupa.com/developer/actionscript/xml_dropdown_menu.htm

but instead of a vertical menu, i want to create a menu that is horizontal.

when i try this, I cant get the submenu to be in the center. please see the attached image.

any ideas?

thanks
Wraj.

==============SOURCE START=====================

menu_xml = new XML();
menu_xml.ignoreWhite = true;
menu_xml.onLoad = function(ok)
{
if(ok)
{
trace(“XML file loaded”);
Createmainmenu(0,0,0,this);
}
};

menu_xml.load(“menu.xml”);

//function that create the menu using the generate menu function
Createmainmenu = function(x,y,depth,menu_xml)
{
GenerateMenu(this,“mainmenu_mc”,x,y,depth,menu_xml.firstChild); //generate a menu
mainmenu_mc.onMouseUp = function()
{
if(mainmenu_mc.submenu_mc && !mainmenu_mc.hitTest(_root.xouse, _rot.ymouse, true))
{
CloseSubmenus();
}
};
};

//remove submenus.
CloseSubmenus = function()
{
mainmenu_mc.submenu_mc.removeMovieClip();
};

//function that generates a menu iteratively
GenerateMenu = function(container, name, x, y, depth, xml_node)
{
trace(“generate Menu called”);
var curr_node;
var curr_item;
var curr_menu = container.createEmptyMovieClip(name,depth);

//loop through to attach menuitem clips
for(var i=0; i<xml_node.childNodes.length; i++)
{
    trace("attaching clip "+i);
    curr_item = curr_menu.attachMovie("menuitem","menu_item"+i,depth+i);
    curr_item._y = y;
    curr_item._x = x + i*curr_item._width;
    curr_item.trackAsMenu = true;
    
    curr_menu._x = (Stage.width/2) - (((i+1)*150)/2);  //CENTERING SUBMENUS
    
    //insert attributes into the menu item
    curr_node = xml_node.childNodes*;
    curr_item.button_text.text = curr_node.attributes.name;
    
    if(xml_node.childNodes*.nodeName == "menu")
    {
        curr_item.xml_node = curr_node;
        curr_item.onRollOver = curr_item.onDragOver = function()
        {
            var y = this._y + 25;
            GenerateMenu(curr_menu,"submenu_mc",x,y,1000,this.xml_node);
        }
    }
    else
    {
        curr_item.arrow._visible = false;
        curr_item.onRollOver = curr_item.onRollOver = curr_item.onDragOver = function()
        {
            curr_menu.submen_mc.removeMovieClip();
        }
    }
}

};

//button actions
Actions = Object();
Actions.gotoURL = function(urlVar)
{
getURL(urlVar,"_blank");
};

Actions.newTab = function()
{
//create a new tab for second level menu
}

=====================SOURCE END ==============