Flash player on 64 bits kernel of CentOS

Reinstall my laptop again with CentOS 5.4 64 bits. This time, I can't play youtube on my Opera browser. Uninstall Flash 32 bits. Then go to http://labs.adobe.com/downloads/flashplayer10_square.html to download the 64 bits flash plugin for Linux. Copy it libflashplayer.so to /usr/lib/opera/plugins. Restart browser and confirm the plugin path include /usr/lib/opera/plugins.