var first_off = new Image();
   	first_off.src = "images/left_what.gif";
   	var first_on = new Image();
   	first_on.src = "images/left_what_over.gif";

	var second_off = new Image();
   	second_off.src = "images/left_retailer.gif";
   	var second_on = new Image();
  	second_on.src = "images/left_retailer_over.gif";

	var third_off = new Image();
   	third_off.src = "images/left_hosp.gif";
   	var third_on = new Image();
  	third_on.src = "images/left_hosp_over.gif";
  
	var fourth_off = new Image();
   	fourth_off.src = "images/left_where.gif";
   	var fourth_on = new Image();
  	fourth_on.src = "images/left_where_over.gif";
  
	var fifth_off = new Image();
   	fifth_off.src = "images/left_contact.gif";
   	var fifth_on = new Image();
  	fifth_on.src = "images/left_contact_over.gif";

	var sixth_off = new Image();
   	sixth_off.src = "images/left_about.gif";
   	var sixth_on = new Image();
  	sixth_on.src = "images/left_about_over.gif";
	
	var seventh_off = new Image();
   	seventh_off.src = "images/left_home.gif";
   	var seventh_on = new Image();
  	seventh_on.src = "images/left_home_over.gif";
	
	var eighth_off = new Image();
   	eighth_off.src = "images/left_colors.gif";
   	var eighth_on = new Image();
  	eighth_on.src = "images/left_colors_over.gif";
	
   function activate(imgName) {
     if ( eval(imgName + "_on.src") ) {
       document.images[imgName].src = eval(imgName + "_on.src");
     }
   }

   function deactivate(imgName) {
     if ( eval(imgName + "_off.src") ) {
       document.images[imgName].src = eval(imgName + "_off.src");
     }
   }