if (document.images) {
  		homeOn = new Image();
  		homeOn.src = "images/navs/home_on.gif";
  		toursOn = new Image();
  		toursOn.src = "images/navs/tours_on.gif";
		walksOn = new Image();
  		walksOn.src = "images/navs/walks_on.gif";
		tipsOn = new Image();
  		tipsOn.src = "images/navs/tips_on.gif";
  		aboutOn = new Image();
  		aboutOn.src = "images/navs/about_on.gif";
  		feedbackOn = new Image();
  		feedbackOn.src = "images/navs/feedback_on.gif";
		contactusOn = new Image();
  		contactusOn.src = "images/navs/contactus_on.gif";
  		homeOff = new Image();
  		homeOff.src = "images/navs/home.gif";
  		toursOff = new Image();
  		toursOff.src = "images/navs/tours.gif";
		walksOff = new Image();
  		walksOff.src = "images/navs/walks.gif";
		tipsOff = new Image();
  		tipsOff.src = "images/navs/tips.gif";
 		aboutOff = new Image();
  		aboutOff.src = "images/navs/about.gif";
 		feedbackOff = new Image();
  		feedbackOff.src = "images/navs/feedback.gif";		
		contactusOff = new Image();
  		contactusOff.src = "images/navs/contactus.gif";
  	}

	function changeImages() {
  		if (document.images) {
   			for (var i=0; i<changeImages.arguments.length; i+=2) {
      			document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    			}
  			}
		}