function navItem (name, width, height) {
this.on = new Image();
this.on.src = "http://www.thejewishweek.com/img/nav/" + name + "on.gif"
this.off = new Image();
this.off.src = "http://www.thejewishweek.com/img/nav/" + name +  "off.gif"
}

function nav_new (name) {
navItem[name] = new navItem(name);
}

function img_act (imgName) {
    if (document.images) document[imgName].src = navItem[imgName].on.src;
}

function img_inact (imgName) {
    if (document.images) document [imgName].src =
navItem[imgName].off.src;
}

function load_nav (name, num) {
for (i = 1; i <= num; i++) nav_new(name + i);
}

    if (document.images != null) load_nav('nav', 41);