tyvole...

        <script type="text/javascript">
          var value = "";
          function getCharacter(a)
            {
              var character = a;
              if (character == "9")
                {
                  value += "9";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 8)
                {
                  value += "8";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 7)
                {
                  value += "7";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 6)
                {
                  value += "6";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 5)
                {
                  value += "5";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 4)
                {
                  value += "4";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 3)
                {
                  value += "3";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 2)
                {
                  value += "2";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 1)
                {
                  value += "1";
                  document.getElementById("calculator").innerHTML= value;
                }
              else if (character == 0)
                {
                  value += "0";
                  document.getElementById("calculator").innerHTML= value;
                }
            }
        </script>