How to call JavaScript function from controller in mvc3

I am building through a problem i.e. How could I call JavaScript function through my controller,i am basically using scriptmanager.registerclientscriptblock but the code is error full which prevents me to proceed, i dont want to go with JSON or any plugins only I want simple JavaScript calling logic,here you go for the code please

                        {
                            Session["UserDetails"] = strConCat;
                            Session["objLoginUser"] = objUser;
                            string strScript = "AlertConfirmRe();";---------//This is my JScript function
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "TEST", strScript, true);                                                                
            return;
                        }