Changing jQuery UI’s Dialog widget’s default options

While jQuery UI’s Dialog widget has good default options, there may be circumstances when you want to change them. For instance, you may want all dialog windows to be modal windows, with a semi-transparent background and the bgiframe plugin applied. Place this code at the end of the page, or within $(document).ready.

$.extend($.ui.dialog.defaults, {
 overlay : { background: "#000", opacity: 0.8},
 modal: true,
 bgiframe: true