if (document.images) {
    var navi_topOn= new Image();
    navi_topOn.src = "../img/navi_top-over.gif";
    var navi_topOff = new Image();
    navi_topOff.src = "../img/navi_top.gif";
    var navi_02On= new Image();
    navi_02On.src = "../img/navi_02-over.gif";
    var navi_02Off = new Image();
    navi_02Off.src = "../img/navi_02.gif";
    var navi_03On= new Image();
    navi_03On.src = "../img/navi_03-over.gif";
    var navi_03Off = new Image();
    navi_03Off.src = "../img/navi_03.gif";
    var navi_04On= new Image();
    navi_04On.src = "../img/navi_04-over.gif";
    var navi_04Off = new Image();
    navi_04Off.src = "../img/navi_04.gif";
    var navi_05On= new Image();
    navi_05On.src = "../img/navi_05-over.gif";
    var navi_05Off = new Image();
    navi_05Off.src = "../img/navi_05.gif";
    var navi_06On= new Image();
    navi_06On.src = "../img/navi_06-over.gif";
    var navi_06Off = new Image();
    navi_06Off.src = "../img/navi_06.gif";
    var navi_07On= new Image();
    navi_07On.src = "../img/navi_07-over.gif";
    var navi_07Off = new Image();
    navi_07Off.src = "../img/navi_07.gif";
    var navi_08On= new Image();
    navi_08On.src = "../img/navi_08-over.gif";
    var navi_08Off = new Image();
    navi_08Off.src = "../img/navi_08.gif";
    var navi_09On= new Image();
    navi_09On.src = "../img/navi_09-over.gif";
    var navi_09Off = new Image();
    navi_09Off.src = "../img/navi_09.gif";
    }
function rolloverOn(imgName) {
    if (document.images) {
        document.images[imgName].src=eval(imgName + "On.src");
    }
}
function rolloverOff(imgName) {
    if (document.images) {
        document.images[imgName].src=eval(imgName + "Off.src");
    }
}