function hidelayer(layername){
  if(document.layers){
           document.layers[layername].visibility="hide";
  }else{
          layername=document.getElementById(layername);
          layername.style.visibility="hidden";
        }
}

function schowlayer(layername){
  if(document.layers){
           document.layers[layername].visibility="show";
  }else{
          layername=document.getElementById(layername);
          if(!document.all && document.getElementById){ layername.style.right="8px"; }
          layername.style.visibility="visible";
        }
}