function showimage (divobj) {
        document.getElementById(divobj).style.display = 'block';
      }
      function hideimage (divobj) {
        document.getElementById(divobj).style.display = 'none';
      }

      function showmenu (divobj) {
        divobj.style.visibility = 'visible';
      }
      function hidemenu (divobj) {
        divobj.style.visibility = 'hidden';
      }

      function showmenu (divobj) {
        document.getElementById(divobj).style.visibility = 'visible';
      }
      function hidemenu (divobj) {
        document.getElementById(divobj).style.visibility = 'hidden';
      }

      function formCheck(form) {
        if (form.first_name.value == "") { alert ("Please fill in the 'First Name' field."); return false; }
        if (form.last_name.value  == "") { alert ("Please fill in the 'Last Name' field.");  return false; }
        if (form.email.value      == "") { alert ("Please fill in the 'E-Mail' field.");     return false; }
        if (form.home_phone.value == "") { alert ("Please fill in the 'Home Phone' field."); return false; }
        return true;
      }