// JavaScript Document
  
var currentBoxNum = 1; 
var layerPreffix = "promo_box_";
var tabImgPreffix = "promo_tab_";
var imgDir = "/images/it/"; 

var imgPreloadString = '';

function swapBox (num) {
	if (num == currentBoxNum) return;
	var currentBox, newBox, tabImg;
	if ((currentBox = getEl(layerPreffix + currentBoxNum)))  currentBox.style.display = "none";
	if ((newBox = getEl(layerPreffix + num)))  newBox.style.display = "block";
	currentBoxNum = num;
	
	// swap images
	for (var i=1; i<=3; i++)
	{
		if ((tabImg = getEl(tabImgPreffix + i)))
		{
			if(currentBoxNum != i)
			{
				tabImg.src = imgDir + "tab_" +  i + "_1.png"; 
			}else{
				tabImg.src = imgDir + "tab_" +  i + "_2.png"; 
			}
		}
	}
}

function findImgSrc (obj) {
     //if (obj.style && obj.style.cssText) obj.style.cssText = '';
     if (obj.tagName && obj.tagName.toLowerCase() == 'img' && typeof(obj.src) != "undefined") {
          if (imgPreloadString != '') imgPreloadString += ',';
          imgPreloadString += '\'' + obj.src + '\''; 
     }
     
     if (obj.childNodes && obj.childNodes.length) {
          for (var i=0; i < obj.childNodes.length; i++)  {     
               findImgSrc (obj.childNodes[i]);
          }
     } 
}

for (var i=1; i<=3; i++) {
	for (var j=1; j<=2; j++) {
		if (imgPreloadString != '') imgPreloadString += ',';
		imgPreloadString += '\'' + imgDir + 'tab_' + i + '_' + j+ '.png\'';
	}
}