nav1on = new Image();                    
nav1on.src = "images/nav1_on.gif";
nav1off = new Image();
nav1off.src = "images/nav1_off.gif";

nav2on = new Image();                    
nav2on.src = "images/nav2_on.gif";
nav2off = new Image();
nav2off.src = "images/nav2_off.gif";

nav3on = new Image();                    
nav3on.src = "images/nav3_on.gif";
nav3off = new Image();
nav3off.src = "images/nav3_off.gif";

nav4on = new Image();                    
nav4on.src = "images/nav4_on.gif";
nav4off = new Image();
nav4off.src = "images/nav4_off.gif";

nav5on = new Image();                    
nav5on.src = "images/nav5_on.gif";
nav5off = new Image();
nav5off.src = "images/nav5_off.gif";

nav6on = new Image();                    
nav6on.src = "images/nav6_on.gif";
nav6off = new Image();
nav6off.src = "images/nav6_off.gif";

nav7on = new Image();                    
nav7on.src = "images/nav7_on.gif";
nav7off = new Image();
nav7off.src = "images/nav7_off.gif";

nav8on = new Image();                    
nav8on.src = "images/nav8_on.gif";
nav8off = new Image();
nav8off.src = "images/nav8_off.gif";

nav9on = new Image();                    
nav9on.src = "images/nav9_on.gif";
nav9off = new Image();
nav9off.src = "images/nav9_off.gif";

nav10on = new Image();                    
nav10on.src = "images/nav10_on.gif";
nav10off = new Image();
nav10off.src = "images/nav10_off.gif";

homeon = new Image();                    
homeon.src = "images/powrot_on.gif";
homeoff = new Image();
homeoff.src = "images/powrot_off.gif";



// On function
function imgAct(imgName) {
    document[imgName].src = eval(imgName + "on.src");
}

// Off function
function imgInact(imgName) {
    document[imgName].src = eval(imgName + "off.src");
}