Space between jquery masks

I'm using a jquery mask:

            /// Mascara Telfone
            function mascara(o,f){
                v_obj=o
                v_fun=f
                setTimeout("execmascara()",1)
            }
            function execmascara(){
                v_obj.value=v_fun(v_obj.value)
            }
            function mtel(v){
                v=v.replace(/\D/g,"");             //Remove tudo o que não é dígito
                v=v.replace(/^(\d{2})(\d)/g,"($1) $2"); //Coloca parênteses em volta dos dois primeiros dígitos
                v=v.replace(/(\d)(\d{4})$/,"$1-$2");    //Coloca hífen entre o quarto e o quinto dígitos
                return v;
            }
            function id( el ){
                return document.getElementById( el );
            }
            window.onload = function(){
                id('telefone_input').onkeyup = function(){
                    mascara( this, mtel );
                }
            }

It works cool, but I need to add a space after the next digit after the parentheses, separating the ninth digit from the next 4-digit block. This should occur if it has the ninth digit.