window.addEvent('domready', function() {
									 
	 $$('img.navOff').each(function(img) {  
		var src = img.getProperty('src');  
		var extension = src.substring(src.lastIndexOf('.')-3,src.length);
		
		img.addEvent('mouseenter', function() { img.setProperty('src',src.replace(extension,'hov.gif')); });  
		img.addEvent('mouseleave', function() { img.setProperty('src',src); });  
	   }); 
	 
  });