ns4 = (document.layers)? true:false
 ie4 = (document.all)? true:false

 function simpleLayerWrite(id,text) {
  if (ns4) {
   var lyr = document.layers[id].document
   lyr.open()
   lyr.write(text)
   lyr.close()
  }
  else if (ie4) document.all[id].innerHTML = text
 }