Failing to add custom tool bars on a server. Localhost is ok

Hi

I am trying to add a new custom tool bar. In fckconfig.js I added:

FCKConfig.ToolbarSets["FS1"] = [
['Cut','Copy','Paste','PasteText','-','SpellCheck'],
['Undo','Redo','-','Find','Replace','-','SelectAll','RemoveFormat'],
'/',
['Bold','Italic','Underline','StrikeThrough','-','Subscript','Superscript'],
['OrderedList','UnorderedList','-','Outdent','Indent','Blockquote'],
['JustifyLeft','JustifyCenter','JustifyRight','JustifyFull'],
['Link','Unlink','Anchor'],
'/',
['FontName','FontSize'],
['TextColor','BGColor'],
['-','About'] // No comma for the last row.
] ;

and when I create I use:

oFCKeditor1 = new FCKeditor( 'FCKeditor_1' ) ;
oFCKeditor1.BasePath = "../fckeditor/fckeditor/";
oFCKeditor1.ToolbarSet = "FS1";

All works perfectly on my localhost but when I upload the changes on the server it says toolbar set "FS1" doesn't exist

*** addition

It only happens it FireFox and only on the server. IE on the server is OK as are both IE and FF on localhost! And when I CHANGE or ERASE toolbars it doesn't show! Where does it take the data in FF+server? and why is it different? It also happens only on certain computers. I erased the cache and restarted. Didn't help.