Allow modules to act when an overlay parent window is initialized.
The parent window is initialized when a page is displayed in which the overlay might be required to be displayed, so modules can act here if they need to take action to accommodate the possibility of the overlay appearing within a Drupal page.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_overlay_parent_initialize() {
// Add our custom JavaScript.
drupal_add_js(drupal_get_path('module', 'hook') . '/hook-overlay.js');
}