Add / Remove facebook permissions.

<!-- the button needs to be gated by a permission check, as to show the correct button face of add or remove. i used php sdk to request the users current perms, and show button based on response.
<button id="manage_pagesadd" onclick="addPerm('manage_pages')">Add manage_pages Permissions</button>
<script>
// usage is for onclick events - removePerm('manage_pages');
function removePerm(perm){
    FB.api('/me/permissions/'+perm+'', 'delete', callback);
    function callback(response) {
    //document.getElementById(''+perm+'').innerHTML = "" + response;
    location.reload();
    }
}

// usage is for onclick events - addPerm('manage_pages');
function addPerm(perm){
 FB.login(function (response) {
 if(response.authResponse){
   // handle the response
if(document.getElementById(''+perm+'add')){
document.getElementById(''+perm+'add').innerHTML = "" + response.status;
}else{
document.getElementById('response_object').innerHTML = "" + response.status;
}
if(response.status==='connected'){
location.reload();
}
}
 },{scope: ''+perm+''});

}
</script>