if (document.images) {
var load = "no";

//main menu-site
image1on = new Image(); image1on.src = "/i/navi/1_on.gif";
image2on = new Image(); image2on.src = "/i/navi/2_on.gif";
image3on = new Image(); image3on.src = "/i/navi/3_on.gif";
image4on = new Image(); image4on.src = "/i/navi/4_on.gif";
image5on = new Image(); image5on.src = "/i/navi/5_on.gif";

image1off = new Image(); image1off.src = "/i/navi/1_off.gif";
image2off = new Image(); image2off.src = "/i/navi/2_off.gif";
image3off = new Image(); image3off.src = "/i/navi/3_off.gif";
image4off = new Image(); image4off.src = "/i/navi/4_off.gif";
image5off = new Image(); image5off.src = "/i/navi/5_off.gif";

load = "yes";
}

function imageOff(imgName) {
if (load == "yes") {if (document.images) {document.images[imgName].src = eval(imgName + "off.src");}}
}
function imageOn(imgName) {
if (load == "yes") {if (document.images) {document.images[imgName].src = eval(imgName + "on.src");}}
}