if (document.all) var IE4=true;
else if (document.layers) var NN4=true;
else var OTHER=true;

var inMenu1 = false;

function show(who){
    if (document.layers) {
        who.visibility = 'show';
    }else if (document.all) {
        who.visibility = 'visible';
    }
}

function hide(who){
    if (document.layers) {
        who.visibility = 'hide';
    }else if (document.all) {
        who.visibility = 'hidden';
    }
}

function init() {
    if (document.layers) {
        menu1 = window.document.menuList;
    }else if (document.all) {
        menu1 = menuList.style;
    }
}

function checkMenuVisibility(){
    if (inMenu1 == true) {
        show(menu1);
    } else {
        hide(menu1);
    }
    setTimeout("checkMenuVisibility()", 100);
}

function ImageOn(layerID, imgName) {
  if (IE4) { 
        imgOn = eval(imgName + "on.src"); 
        if (document.images[imgName]) document.images[imgName].src = imgOn;
    }
  if (NN4) { 
        imgOn = eval(imgName + "on.src");
        if (document.layers[layerID].document.images[imgName])
        document.layers[layerID].document.images[imgName].src = imgOn;
    }
}

function ImageOff(layerID, imgName) {
  if (IE4) { 
        imgOff = eval(imgName + "off.src"); 
        if (document.images[imgName]) document.images[imgName].src = imgOff; 
    }
  if (NN4) { 
        imgOff = eval(imgName + "off.src");
        if (document.layers[layerID].document.images[imgName])
        document.layers[layerID].document.images[imgName].src = imgOff; 
    }
}