[SER]

dmitriymar, вот вам хтмл-код:

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

ну и скрипт

$('#unblckbtn').click(function(){
            var rightcode = "q";
            if(document.getElementById('unblckinpt').value != rightcode){
                alert('qqqq');
            } else {
                setcookie("block","no",10);
                $("#errorbody").hide("fast");
            }
});