[jQuery] Callback-return into global variable

[Niels]

Is there any way to put a return from within a callback into a global
variable? I'm trying to retrieve JSON-values in one statement, and
output them in another statement; and code looks like this:

var _json;

function load_comments(id, params) {
        if (typeof id != 'number' && typeof id == 'object' && params == null)
{
                // Only the params were specified.
                _params = process_params(id);

                $.getJSON(paths.get_comment, _params, function(data) { _json = 
data;
return _json; });
                console.info('1 : $.getJSON(' + paths.get_comment + ', ' + 
_params +
')');
        }
}

function display_comments() {
        load_comments();
        $.each(_json.comments, function(comment) {
                $("#recent-comments-list").append("<li>" + comment.content + "</
li>");
        });
}

Unfortunately, _json seems to remain undefined... What am I doing
wrong? Or is there really no way to accomplish this?

Thanks a lot!
Niels