// Variables
   var aButtonsImg = new Array();
   var aButtonsOn  = new Array();
   var aButtonsOff = new Array();
   var aButtons    = new Array();  
 
//load Tops Images
  function loadButtons()
  {
	   
    for (var i=1; i < 7; i++)  //index:0 - empty  < 5
	{
	       aButtonsImg[i] = "BUTTON" + i;
		 
	       aButtonsOn[i] = new Image();
		   aButtonsOn[i].src = "/images/button" + i + "-on.jpg";
		 
		   aButtonsOff[i] = new Image();
		   aButtonsOff[i].src = "/images/button" + i + "-off.jpg";		
		
		   aButtons[i] = new Image();
		   aButtons[i].src = "/images/button" + i + ".jpg";
	}   
	
  }
  

//shift Button On 
  function shiftButtonOn(index)
  {
    if (document.images)
	{
    	document.images[aButtonsImg[index]].src = aButtonsOn[index].src;	  
    }
  }

//shift Button Off 
  function shiftButtonOff(index)
  {
    if (document.images)
	{
    	document.images[aButtonsImg[index]].src = aButtonsOff[index].src;	  
     }
  } 

//Pre-load images  
  loadButtons();