// SIMPLE LAYER SHOW HIDE

NNSSa = (document.layers)? true:false;
IIEEa = (document.all)? true:false;
NNSS6 = (document.getElementById && !document.all)? true:false;

function hide(id) {
        if (NNSSa) eval("document.layers['"+ id + "'].visibility = 'hide'");
        else if (IIEEa) document.all[id].style.visibility = "hidden";
        else if (NNSS6) document.getElementById(id).style.visibility="hidden";

}

function show(id) {
        if (NNSSa) eval("document.layers['" + id + "'].visibility = 'show'");
        else if (IIEEa) document.all[id].style.visibility = "visible";
        else if (NNSS6) document.getElementById(id).style.visibility="visible";

}

function layerExists(id) {
  if (NNSSa) eval("return document.layers['"+ id + "']");
  else if (IIEEa) return document.all[id];
  else if (NNSS6) return document.getElementById(id);
}

function isHidden(id) {
        if (NNSSa) eval("return document.layers['"+ id + "'].visibility == 'hide'");
        else if (IIEEa) return document.all[id].style.visibility == "hidden";
        else if (NNSS6) return document.getElementById(id).style.visibility =="hidden";
}