// ad sizes by position
var LDR_WIDTH = '728';
var LDR_HEIGHT = '90';

var MEDRECT_WIDTH = '300';
var MEDRECT_HEIGHT = '250';

// ad tiles by counting
var tiles = 0;

function AdManager(pos) {

	this.size = function(pos) {
	
		if (pos == 'ldr') {
			return LDR_WIDTH + 'x' + LDR_HEIGHT;
		}
		
		if (pos == 'medrect') {
			return MEDRECT_WIDTH + 'x' + MEDRECT_HEIGHT;
		}	
	}
	
	this.tile = function() {
	
		return ++window.parent.tiles;
	}
}