function show(){document.getElementById('show').style.display="block"; }
function hide(){document.getElementById('show').style.display="none"; }
function second (){document.getElementById('show1').style.display="block";}
function second_hide (){document.getElementById('show1').style.display="none";}
function third () {document.getElementById('show2').style.display="block";}
function third_hide (){document.getElementById('show2').style.display="none";}
function fourth (){document.getElementById('show3').style.display="block";}
function fourth_hide(){document.getElementById('show3').style.display="none";}
function fifth (){document.getElementById('show4').style.display="block";}
function fifth_hide(){document.getElementById('show4').style.display="none";}
function sixth (){document.getElementById('show5').style.display="block";}
function sixth_hide (){document.getElementById('show5').style.display="none";}