How to call Javascript at MasterPage

public static void OpenPageInNewWindow(Page page, string pageUrl)
        {
            Type t=page.GetType();
            StringBuilder sb = new StringBuilder();
            sb.Append("<script language='javascript'>");
            sb.Append("window.open('" + pageUrl + "');");
            sb.Append("</script>");
            if (!page.ClientScript.IsClientScriptBlockRegistered(t,"newwindow"))
            {
                page.ClientScript.RegisterClientScriptBlock(t,"newwindow",sb.ToString());
            }
        }