Some users of OS X 10.5 Leopard don’t seem to be big fans of the transparent menu bar. To You can enable or disable it with the following steps.
1. Check to ensure that you are updated to System 10.5.2.
2. Open System Preferences.
3. Open Desktop & Screen Saver under the Personal section.
4. Uncheck the box for Translucent Menu Bar to disable it. Check the box to enable it.