function showHide(elementId) {
            element = document.getElementById(elementId);
           element.style.display = (element.style.display == "none") ? "block" : "none";
      }
 window.onload = function() {
     document.getElementById("text1").style.display = "none";
     document.getElementById("text2").style.display = "none";
     document.getElementById("text3").style.display = "none";
     document.getElementById("text4").style.display = "none";
     document.getElementById("text5").style.display = "none";
     document.getElementById("text6").style.display = "none";
     document.getElementById("text7").style.display = "none";
     document.getElementById("text8").style.display = "none";
     document.getElementById("text9").style.display = "none";
     document.getElementById("text10").style.display = "none";
     document.getElementById("text11").style.display = "none";
     document.getElementById("text12").style.display = "none";
     document.getElementById("text13").style.display = "none";
     document.getElementById("text14").style.display = "none";
     document.getElementById("text15").style.display = "none";
     document.getElementById("text16").style.display = "none";
     document.getElementById("text17").style.display = "none";
 };