var
      left, top;

    function checkemail(mail){
      var testresults;
      var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;

      if (filter.test(mail))
        testresults=true;
      else
        testresults=false;

      return testresults;
    }

    function validateRegister(){
      pass = true;

      msg = '';

      if (document.getElementById('first_name').value == '')
        msg = "Nebyplnené meno.\n"

      if (document.getElementById('last_name').value == '')
        msg += "Nebyplnené priezvisko.\n"

      if (document.getElementById('address').value == '')
        msg += "Nebyplnená adresa.\n"

      if (document.getElementById('zip').value == '')
        msg += "Nebyplnená PSČ.\n"

      if (document.getElementById('city').value == '')
        msg += "Nebyplnená mesto.\n"

      if (document.frm_register.password.value == '' || (document.frm_register.password.value != document.frm_register.password2.value))
        msg += "Nebyplnené heslo alebo sa nezhoduje.\n"

      if(document.frm_register.email.value.search("@") == -1 )
        msg += '\n Vyplnte spravne email.';


      if (msg != ""){
        alert (msg);
        pass = false;
      }
                      
      return pass;
    }