Hello Mike and Arifin,
fist, thank you for your answers.
Well, I have installed the JCE editor and seems a great tool for edition.
But, still there are some plugins that not appear (please, compare the image 1 and 2).
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In the next image you can show the plugin that I think refer but I can't modify it.
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Can you help me with this troubble ?
Regarding the second option (Arifin), I prefer not install again the Nexus template because I have very modifications implemented in my web site.
Is possible to install a new version of Joomla (1.5.15) without must to install the Nexus template again?
Best regards,
Xavier