<script type="text/javascript" src="http://www.ujs.su/JS/system/jquery.cookie.js"></script>

<script>
$(function () {
if($.cookie('click') != null) {$('#newopen, #new').hide())}
})
</script>

<a href="javascript://" id="newopen" onclick="$.cookie('click', '1', {expires: 1}); " style="font-size:9px;margin-left:5px">[Изменить логин]</a>

<a href="javascript://" id="newopen" style="font-size:9px;margin-left:5px" onclick="cookielogin()">[Изменить логин]</a>
<script type="text/javascript" src="http://usite.su/js/cookie.js"></script>
<script type="text/javascript">
function cookielogin() {
     $.cookie('cookiefunc1', 'ololo' , {expires:1});
};
if($.cookie('cookiefunc1')) {
     $('#newopen, #new').hide();
};
</script>