Show and close a dialog window:
The show() method shows the dialog.
When this method is used to show a dialog window, the user is still able to interact with other elements on the page. If you do not want the user to interact with things other than the dialog, use the showModal() method.
Tip: This method is often used together with the close() method.
The show() method is currently only supported in Opera 24+, Chrome 37+ and Safari 6.