<!-- Hide script from older browsers
	if(document.images)
	{
	  background = new Image;
	  background_on = new Image;
	  classes = new Image;
	  classes_on = new Image;
	  contact = new Image;
	  contact_on = new Image;
	  home = new Image;
	  home_on = new Image;
	  
	  patient_info =  new Image;
	  patient_info_on =  new Image;
	  reading = new Image;
	  reading_on = new Image;
	  shop = new Image;
	  shop_on = new Image;
	  treatments = new Image;
	  treatments_on = new Image;
	  
	  

	  background.src = "images/nav/background.gif";
	  background_on.src = "images/nav/background_on.gif";
	  classes.src = "images/nav/classes.gif";
	  classes_on.src = "images/nav/classes_on.gif";
 	  contact.src = "images/nav//contact.gif";
	  contact_on.src = "images/nav/contact_on.gif";
	  home.src = "images/nav/home.gif";
	  home_on.src = "images/nav/home_on.gif";
	  patient_info.src = "images/nav/patient_info.gif";
	  patient_info_on.src = "images/nav/patient_info_on.gif";
	  reading.src = "images/nav/reading.gif";
	  reading_on.src = "images/nav/reading_on.gif";
	  shop.src = "images/nav/shop.gif";
	  shop_on.src = "images/nav/shop_on.gif";
	  treatments.src = "images/nav/treatments.gif";
	  treatments_on.src = "images/nav/treatments_on.gif";
	  

	}	
	else
	  {
	     background = '';
	     background_on = '';
	     classes = '';
	     classes_on = '';
	     seniors =  '';
	     seniors_on =  '';
	     kids = '';
	     kids_on = '';
	     cosmetic = '';
	     cosmetic_on = '';
	     ask = '';
	  	     	  
	  
	     home = '';
	     home_on = '';
	     provider = '';
	     provider_on = '';
	     logout = '';
	     logout_on = '';
	     hw_resources = '';
	     hw_resources_on = '';
	     contact = '';
	     contact_on = '';
  }
	
	function chgImg(imgField,newImg) {
	if (document.images) 
	   { document[imgField].src= eval(newImg + ".src") }                  	
       }
	
	

	//end hiding script-->