var isNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&
                parseFloat(navigator.appVersion) >= 4) ? 1 : 0;
var isIE4 = (document.all) ? 1 : 0;

function showLayer(layer) {
  if (isNS4) layer.visibility = "show";
  if (isIE4) layer.style.visibility = "visible";
}

function hideLayer(layer) {
  if (isNS4) layer.visibility = "hide";
  if (isIE4) layer.style.visibility = "hidden";
}

//ShowHide('lyr1','hidden')
//ShowHide('lyr1','visible')
//updated 140607
function ShowHideDiv(obj, visibility) {
  if(document.getElementById){
    divs = document.getElementsByTagName("div");
    divs[obj].style.visibility = visibility;
  }
}