[Deff]

. Если скрипт вставить в head,

Поправил

<script src="http://code.jquery.com/jquery-latest.js"></script>

<input type="text" id="unblckinpt" value="" placeholder="Enter secret code here" size="40"><br>
<input type="button" id="unblckbtn" value="Отправить">

<script type="text/javascript">
$(document).ready(function(){
  $('#unblckbtn').click(function(){
            var rightcode = "q";
            if($('#unblckinpt').val() != rightcode){
                alert('qqqq');
            } else {
                //setcookie("block","no",10);
                $("#errorbody").hide("fast");
            }
  });
});
</script>