var curLyr;
  
    
  function lyrShow(id) {
     var lyr = getElemRefs(id);
     if (lyr && lyr.css) {
        lyr.css.visibility = "visible";
     }
  }
  
     
  function lyrHide(id) {
     var lyr = getElemRefs(id);
     if (lyr && lyr.css) {
        lyr.css.visibility = "hidden";
     }
  }
  
     
  function getElemRefs(id) {
     var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? getLyrRef(id,document): null;
     if (el) el.css = (el.style)? el.style: el;
     return el;
  }
  
   
  function getLyrRef(lyr,doc) {
     if (document.layers) {
        var theLyr;
        for (var i=0; i<doc.layers.length; i++) {
           theLyr = doc.layers[i];
           if (theLyr.name == lyr) return theLyr;
           else if (theLyr.document.layers.length > 0)
           if ((theLyr = getLyrRef(lyr,theLyr.document)) != null) return theLyr;
        }
        return null;
     }
  }