### 1st we need to define HOOK before we set the website:
      #     *open_url() is a Subroutine:
      $about_window->set_url_hook("open_url");

      ### Now we call the set_website() function:
      #     *The $website var will be passed as an ARG to open_url():
      $about_window->set_website($website);

	# This receives 2 Args:
	#     ARG[0] --> AboutDialog Widget
	#     ARG[1] --> $website
	sub open_url() {
		my ($widget, $url) = @_;
		print "   url == $url\n";
		print "Widget == $widget\n\n";
		open_browser($url);
	}