// these are the nav images
 
 if (document.images)
 
 	{
	start_swapOn= new Image(56,12);		
	start_swapOn.src="images/start_down.gif";
	start_swapOff= new Image(56,12);		
	start_swapOff.src="images/start_up.gif";
	} 
	{
	return_swapOn= new Image(56,12);		
	return_swapOn.src="images/return_down.gif";
	return_swapOff= new Image(56,12);		
	return_swapOff.src="images/return_up.gif";
	} 
 

//this is the function  
 
function turnon(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "On.src");
      document[imgName].src= imgOn;
    }
 }
 
function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "Off.src");
      document[imgName].src= imgOff;
    }
 }