Setting the _x value

programming flash
1

I am having trouble resetting the _x value of a movieclip. I have 3 MCs that scroll along the bottom. When one of the three clips move to far to either the right or left side, I want to move it to the opposite side. Here is a sample of the code I am trying to use to do this:


function moveLeft(position, index) {
	//check if index is negative nubmer
	if (index <0) {
			index = -index;
		}
	//get story # if index is over the total number of stories
	if (index >= entryNode.length) {
		index = index-entryNode.length*(Math.floor(index/entryNode.length));
	}
	//if the first TN is clicked, get url
	if (position == 0){
		getURL(links[index]);
	}
	//move TNs left
	else {
		for (h=0; h<3; h++) {
			//move tnSets
			trace(_root.tnContainer_mc["tnSet"+h]._x);
			var current_mc = _root.tnContainer_mc["tnSet"+h];
			var oldX = current_mc._x;
			var newX = current_mc._x - ((tnWidth+tnSpacing)*position);
			setEase(current_mc, oldX, newX);
			//move tnSet to the right if too far left
			if (_root.tnContainer_mc["tnSet"+h]._x <= -2*(tnSet._width + 10)){
		    	trace('move right: '+ _root.tnContainer_mc["tnSet"+h]);
		    	_root.tnContainer_mc["tnSet"+h]._x = (tnSet._width+10);
				trace(_root.tnContainer_mc["tnSet"+h]._x)
			}
		}
	loadStory(index);
	}
}

I have zipped my .fla file and attached it.