Use of window.showModalDialog() is deprecated. Use window.open() instead. For more help https://developer.mozilla.org/en-US/docs/Web/API/Window.open
Zaharkituta dago window.showModalDialog() erabiltzea. Honen ordez, erabili window.open(). Laguntza gehiagorako: https://developer.mozilla.org/en-US/docs/Web/API/Window.open