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From Elxis Official Documentation

Because of a small bug the Elxis' TinyMCE editor wont work properly on Elxis 2009.0 or older releases when you manage hotels or rooms from front-end (there is no problem when you work from the administration's area). To make it work properly you have to either upgrade Elxis to 2009.1 (recommended) or apply the fix shown bellow.

When the problem occurs

The TinyMCE wont be loaded properly when: You manage hotels or rooms from the IOS Reservations Control Panel in Elxis front-end area AND you have enabled the WYSIWYG editor AND you use Elxis 2009.0, 2008.1 or 2008.0. In all other cases you don't have to apply a fix!

How to fix the editor

In case you face the problem follow these orders to fix the editor.

Open mambots/editors/tinymce.php file with any text editor (pspad is free and fine).

Find function botTinymceEditorInit (line 101).

In the top of this function you will find this block of code:

if (defined ('_SIMPLY_TINYMCE')) {
    botTinymceEditorInitF();
    return;
}

Change it to:

if (defined ('_SIMPLY_TINYMCE')) {
    return botTinymceEditorInitF();
}

Save the file, done!