if (document.images) {

        var nav1_off = new Image();
        nav1_off.src = "images/nav/nav1_off.gif";
        var nav1_on = new Image();
        nav1_on.src = "images/nav/nav1_on.gif";

        var nav2_off = new Image();
        nav2_off.src = "images/nav/nav2_off.gif";
        var nav2_on = new Image();
        nav2_on.src = "images/nav/nav2_on.gif";

        var nav3_off = new Image();
        nav3_off.src = "images/nav/nav3_off.gif";
        var nav3_on = new Image();
        nav3_on.src = "images/nav/nav3_on.gif";

		var nav4_off = new Image();
        nav4_off.src = "images/nav/nav4_off.gif";
        var nav4_on = new Image();
        nav4_on.src = "images/nav/nav4_on.gif";

        var nav5_off = new Image();
        nav5_off.src = "images/nav/nav5_off.gif";
        var nav5_on = new Image();
        nav5_on.src = "images/nav/nav5_on.gif";

        var nav6_off = new Image();
        nav6_off.src = "images/nav/nav6_off.gif";
        var nav6_on = new Image();
        nav6_on.src = "images/nav/nav6_on.gif";

        var nav7_off = new Image();
        nav7_off.src = "images/nav/nav7_off.gif";
        var nav7_on = new Image();
        nav7_on.src = "images/nav/nav7_on.gif";

        var nav8_off = new Image();
        nav8_off.src = "images/nav/nav8_off.gif";
        var nav8_on = new Image();
        nav8_on.src = "images/nav/nav8_on.gif";

}

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

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

function restore() {
  self.location.reload();
}