// these are the nav images
 
 if (document.images)
 
 {					
	navover_enterOn= new Image(56,12);		
	navover_enterOn.src="images/navover_enter.gif";
	navover_enterOff= new Image(56,12);		
	navover_enterOff.src="images/nav_enter.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;
    }
 }