function validation ()
{
  var errors = '';

$.get("php/check_antibot.php?sec_code=" + $('#sec_code').val(), function(data){
if ('f' == data){
    errors += "Please enter valid Captcha\n";
}
if ('' != errors) {
    alert(errors);
    return false;
} else {
    $('form').submit();
}
});
return false;

}