function switchFirst()
  {
         document.getElementById("first").style.visibility = "visible";
         document.getElementById("second").style.visibility = "hidden";
         document.getElementById("third").style.visibility = "hidden";
         document.getElementById("option1").style.fontWeight = "bold";
         document.getElementById("option2").style.fontWeight = "normal";
         document.getElementById("option3").style.fontWeight = "normal";
  }
function switchSecond()
  {
         document.getElementById("first").style.visibility = "hidden";
         document.getElementById("second").style.visibility = "visible";
         document.getElementById("third").style.visibility = "hidden";
         document.getElementById("option1").style.fontWeight = "normal";
         document.getElementById("option2").style.fontWeight = "bold";
         document.getElementById("option3").style.fontWeight = "normal";
  }
function switchThird()
  {
         document.getElementById("first").style.visibility = "hidden";
         document.getElementById("second").style.visibility = "hidden";
         document.getElementById("third").style.visibility = "visible";
         document.getElementById("option1").style.fontWeight = "normal";
         document.getElementById("option2").style.fontWeight = "normal";
         document.getElementById("option3").style.fontWeight = "bold";
  }