isIE=document.all;
isNN=!document.all&&document.getElementById;
isN4=document.layers;
isHot=false;

function hideLayer( LayName ){
  whichDog=isIE ? eval('document.all.'+LayName) : document.getElementById(LayName);  
  if (isIE||isNN) whichDog.style.visibility="hidden";
  else if (isN4) eval('document.'+LayName+'.visibility=\"hide\"');
}

function showLayer( LayName ){
    whichDog=isIE ? eval('document.all.'+LayName) : document.getElementById(LayName);    
    if (isIE||isNN) whichDog.style.visibility="visible";
    else if (isN4) eval('document.'+LayName+'.visibility=\"show\"');
}