XML Current & Next Item

Hi, I have this code within the flash to load in the XML file. A list of buttons is generated from the XML list. How do I find out which is the current 'item' selected, and then how to select the next 'item' from the XML list - Thanks

myXML = new XML();
myXML.ignoreWhite = true;
myXML.load("items.xml");
myXML.onLoad = function(_status) {
if (_status) {
var clientList:Array = [];
var clientRegistry:Object = {};
tempxml = myXML.firstChild.childNodes;
var space = 10;

for (var i = 0; i<tempxml.length; i++) {
var clientData:Object = {};
var item = all_items.list_mc.attachMovie("clip", "clip"+i, i);

item._x = clientData["x"]=(item._width+space)*i;
item.title_txt.text = clientData["title"]=tempxml.attributes.title;
item.path = tempxml.attributes.path;
item.thumb = tempxml.attributes.thumb;
item.swf = tempxml.attributes.swf;
}

}
};