function webpushr_signup_popup(){

window.open('https://app.webpushr.com/signup?url=<?= site_url();?>',"wpushr-signup-dialog","width=600, height=550, resizable=0, scrollbars=0, status=0, titlebar=0, left=" + ((screen.width - 600) / 2) + ", top=" + ((screen.height - 550) / 2) );
}