// JavaScript Document
    if (document.images) {            
            img1on = new Image();   img1on.src = "images/topb1a.gif"; 
            img2on = new Image();   img2on.src = "images/topb2a.gif";
            img3on = new Image();   img3on.src = "images/topb3a.gif";
              
            img4on = new Image();   img4on.src = "images/b_state1a.gif";
            img5on = new Image();   img5on.src = "images/b_state2a.gif";  
            img6on = new Image();   img6on.src = "images/b_state3a.gif"; 
            img7on = new Image();   img7on.src = "images/b_state4a.gif"; 
            img8on = new Image();   img8on.src = "images/b_state5a.gif"; 
            img9on = new Image();   img9on.src = "images/b_state6a.gif"; 
            img10on = new Image();   img10on.src = "images/b_state7a.gif"; 
                                    

            img1off = new Image();  img1off.src = "images/topb1.gif";
            img2off = new Image();  img2off.src = "images/topb2.gif";
            img3off = new Image();  img3off.src = "images/topb3.gif";
            
            img4off = new Image();  img4off.src = "images/b_state1.gif";
            img5off = new Image();  img5off.src = "images/b_state2.gif";
            img6off = new Image();  img6off.src = "images/b_state3.gif";
            img7off = new Image();  img7off.src = "images/b_state4.gif";
            img8off = new Image();  img8off.src = "images/b_state5.gif";
            img9off = new Image();  img9off.src = "images/b_state6.gif";
            img10off = new Image();  img10off.src = "images/b_state7.gif";

      }

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

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