// JavaScript Document

var imgs = new Array();
var imgs_off = new Array();
var imgs_ads_left = new Array();
var imgs_ads_right = new Array();

function loadimgs()
{
 var url,prefix,surfix;
 
 url = "images/";
 prefix = url + "menu_on_";
 prefix_off = url + "menu_off_";
 surffix = ".jpg";
 for(i=1;i<=4;i++)
 {
  imgs[i] = new Image;
  imgs_off[i] = new Image;
  imgs_ads_left[i] = new Image;
  imgs_ads_right[i] = new Image;
  imgs[i].src = prefix + i + surffix;
  imgs_off[i].src =  prefix_off + i + surffix;
  imgs_ads_left[i].src = url + "swap/ad"+i+"_1.jpg";
  imgs_ads_right[i].src = url + "swap/ad"+i+"_2.jpg"; 

  }
swapimg(1);
}
function swapimg(id){
  var obj, labels, adleft,adright;

  for(var j=1; j<=4;j++){ 
    obj = document.getElementById("img"+j); 
	labels = document.getElementById("label"+j);
	labels.style.display ="none";
	obj.setAttribute("src",prefix_off + j + surffix);
	}
	
	obj = document.getElementById("img"+id);
	adleft = document.getElementById("imgleft");
	adright = document.getElementById("imgright");
	labels = document.getElementById("label"+id);
	labels.style.display="block";
	obj.src = imgs[id].src;
	adleft.src = imgs_ads_left[id].src;
	adright.src = imgs_ads_right[id].src;
}