//Create array of nav bar "on" images
if (document.images) {
        nav1 = new Image();
        nav1.src = "images/nav_1_237X20_on.gif";
        nav2 = new Image();
        nav2.src = "images/nav_2_237X20_on.gif";
        nav3 = new Image();
        nav3.src = "images/nav_3_237X20_on.gif";
        nav4 = new Image();
        nav4.src = "images/nav_4_237X20_on.gif";
	 nav5 = new Image();
        nav5.src = "images/nav_5_237X20_on.gif";
        nav6 = new Image();
        nav6.src = "images/nav_6_237X20_on.gif";
        nav7 = new Image();
        nav7.src = "images/nav_7_237X20_on.gif";                
        nav8 = new Image();
        nav8.src = "images/nav_8_237X20_on.gif";
        nav9 = new Image();
        nav9.src = "images/nav_9_237X20_on.gif";
        nav10 = new Image();
        nav10.src = "images/nav_10_237X20_on.gif";
        nav11 = new Image();
        nav11.src = "images/nav_11_237X20_on.gif";
	 nav12 = new Image();
        nav12.src = "images/nav_12_237X20_on.gif";
        
    }


//Create array of nav bar "off" images
if (document.images) {
        nav1off = new Image();
        nav1off.src = "images/nav_1_237X20_off.gif";
        nav2off = new Image();
        nav2off.src = "images/nav_2_237X20_off.gif";
        nav3off = new Image();
        nav3off.src = "images/nav_3_237X20_off.gif";
        nav4off = new Image();
        nav4off.src = "images/nav_4_237X20_off.gif";
	 nav5off = new Image();
        nav5off.src = "images/nav_5_237X20_off.gif";
        nav6off = new Image();
        nav6off.src = "images/nav_6_237X20_off.gif";
        nav7off = new Image();
        nav7off.src = "images/nav_7_237X20_off.gif";                
        nav8off = new Image();
        nav8off.src = "images/nav_8_237X20_off.gif";
        nav9off = new Image();
        nav9off.src = "images/nav_9_237X20_off.gif";
        nav10off = new Image();
        nav10off.src = "images/nav_10_237X20_off.gif";
        nav11off = new Image();
        nav11off.src = "images/nav_11_237X20_off.gif";
	 nav12off = new Image();
        nav12off.src = "images/nav_12_237X20_off.gif";
		
    }



//function to activate images

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

//functions to deactivate images

function imgOff(imgName) {
        if (document.images) {
                document[imgName].src = "moi.gif";
        }
}

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