function check_email(e) {
ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";

for(i=0; i < e.length ;i++){
if(ok.indexOf(e.charAt(i))<0){
return (false);
}
}

if (document.images) {
re = /(@.*@)|(\.\.)|(^\.)|(^@)|(@$)|(\.$)|(@\.)/;
re_two = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
if (!e.match(re) && e.match(re_two)) {
return (-1);
}

}

}
  function changeClass(idname, classname) { // by Micha³ 'REGi' Rygielski http://regi.gamedev.pl
    class_ = document.getElementById(idname);
    class_.setAttribute("class", classname);
    class_.setAttribute("className", classname);
  }

  function sprawdzEmail(adres) {
    if (adres != "") {
      var re = new RegExp("[^@]{1,}[@]{1}[^@.]{1,}[.]{1}[^@]{1,}","gi");
      var wynik = re.test(adres);
      if (wynik == true) { return true; }
      if (wynik == false) { return false; }
    }
  }


  function sprawdzZnaki(value) {
    if (value!= "") {
      var re = new RegExp("[^a-z0-9_]","gi");
      var wynik = re.test(value);
      if (wynik == true) { return true; }
      if (wynik == false) { return false; }
    }
  }


function ShowTab(name) {
  document.getElementById().style.display='block';
}