javascript cookie problem

hej

hvad er der galt i nedenstående, min kode giver scriptfejl ved definitionen af min cookie

<script type="text/javascript">
<!--
    function toggle_visibility(id) {
      var e = document.getElementById(id);
      if(e.style.display == 'block')
          e.style.display = 'none';
          SetCookie(location,+id+,0);
      else
          e.style.display = 'block';
          SetCookie(location,+id+,1);
    }
   
function SetCookie(cookieName,cookieValue,nDays) {
var today = new Date();
var expire = new Date();
if (nDays==null || nDays==0) nDays=1;
expire.setTime(today.getTime() + 3600000*24*nDays);
document.cookie = cookieName+"="+escape(cookieValue)
                + ";expires="+expire.toGMTString();
}

//-->
</script>