[jQuery] Synthax problem

[fabbx]

Hi everyone

I have a problem with the use of an ajax call in a function. I want to
get the result of the ajax call for processing to the return of the
function.

I've tried something like that

function checkUsername(s)
{
        TO_RETURN = $.ajax({
                type: "POST",
                url: 'http://'+ CURRENT_DOMAIN + '/ajax/checkUsernameExists/
username/'+s,
                async: false,
                success: function(msg){
                        if(msg=='true'){
                                return true;
                        } else {
                                return false;
                        }
                }
        });


        if(TO_RETURN) return true;
        else return false;
}

But it didn't work ...

If anyone could help me :)

PS : I'm a novice in jQuery and i have low skills in javascripts