function Display(tab){

  if(tab == "tab1"){

    document.getElementById("qaTab01").style.display = "block";
    document.getElementById("qaTab02").style.display = "none";
    document.getElementById("qaTab03").style.display = "none";

  }else if(tab == "tab2"){

    document.getElementById("qaTab01").style.display = "none";
    document.getElementById("qaTab02").style.display = "block";
    document.getElementById("qaTab03").style.display = "none";

  }else if(tab == "tab3"){

    document.getElementById("qaTab01").style.display = "none";
    document.getElementById("qaTab02").style.display = "none";
    document.getElementById("qaTab03").style.display = "block";

  }
}