if (document.images) {
             pic1on = new Image();
             pic1on.src = "images/menu_photographs_on.jpg";
             pic2on = new Image();
             pic2on.src = "images/menu_remasters_on.jpg";
             pic3on = new Image();
             pic3on.src = "images/menu_overpainted_on.jpg";
             pic1off = new Image();
             pic1off.src = "images/menu_photographs_off.jpg";
             pic2off = new Image();
             pic2off.src = "images/menu_remasters_off.jpg";
             pic3off = new Image();
             pic3off.src = "images/menu_overpainted_off.jpg";

		  } else {
            alert("Sorry, your browser does not support image rollovers. This feature will be turned off.");
          }             


     function img_act(imgName) {
             if (document.images) {
             imgOn = eval(imgName + "on.src");
             document [imgName].src = imgOn;
             }
     }

     function img_inact(imgName) {
             if (document.images) {
             imgOff = eval(imgName + "off.src");
             document [imgName].src = imgOff;
             }
     }