var layerRef
var styleSwitch

function isNetscape(){
  if (navigator.appName == "Netscape") {
    return true
  }else{
    return false
  }
}

if (isNetscape()) {
  layerRef="document.layers";
  styleSwitch="";
}else{
  layerRef="document.all";
  styleSwitch=".style";
}

function showMessage(name){
   eval(layerRef+'["'+name+'"]'+styleSwitch+'.visibility="visible"');
}

function hideMessage(name){
   eval(layerRef+'["'+name+'"]'+styleSwitch+'.visibility="hidden"');
}