function show(divid) { document.getElementById("cat1").style.visibility="hidden";  document.getElementById("cat2").style.visibility="hidden";  document.getElementById("cat3").style.visibility="hidden";  document.getElementById("cat4").style.visibility="hidden";  document.getElementById("cat5").style.visibility="hidden";  document.getElementById("cat6").style.visibility="hidden";  document.getElementById("cat7").style.visibility="hidden";  document.getElementById("cat8").style.visibility="hidden";  document.getElementById("cat9").style.visibility="hidden";  document.getElementById("cat10").style.visibility="hidden";  document.getElementById("cat11").style.visibility="hidden"; document.getElementById(divid).style.visibility="visible"; }