var base = "/images/";

        if (document.images) {            
                       
            image1off = new Image();  image1off.src = base + "mmHomeOff.gif"; 
            image1on = new Image();   image1on.src = base + "mmHomeOn.gif"; 
           
            image2off = new Image();  image2off.src = base + "mmSearchOff.gif"; 
            image2on = new Image();   image2on.src = base + "mmSearchOn.gif"; 
           
            image3off = new Image();  image3off.src = base + "mmShowScheduleOff.gif"; 
            image3on = new Image();   image3on.src = base + "mmShowScheduleOn.gif"; 
           
            image4off = new Image();  image4off.src = base + "mmShippingOff.gif"; 
            image4on = new Image();   image4on.src = base + "mmShippingOn.gif"; 

            image5off = new Image();  image5off.src = base + "mmContactUsOff.gif"; 
            image5on = new Image();   image5on.src = base + "mmContactUsOn.gif"; 

            image6off = new Image();  image6off.src = base + "mmCheckoutOff.gif"; 
            image6on = new Image();   image6on.src = base + "mmCheckoutOn.gif"; 
          
                   
        }

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

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