My changes in the Toolbarset doens't work

I changed the toolbarbuttons in the toolbarset "Default" but the browser (firefox) show me the Standard Default toolbarset. There are no changes!!!
I changed in fckconfig.js:

FCKConfig.ToolbarSets["Default"] = [
   ['Source','-','Preview','-','Templates'],
   ['Print'],
   ['Undo','Redo'],
   '/',
   ['Bold','Italic','Underline','StrikeThrough','-','Subscript','Superscript'],
   ['OrderedList','UnorderedList','-','Outdent','Indent'],
   ['JustifyLeft','JustifyCenter','JustifyRight','JustifyFull'],
   ['Link','Unlink','Anchor'],
   ['Image'],
   '/',
   ['TextColor','BGColor']
] ;

But this show me the browser:

FCKConfig.ToolbarSets["Default"] = [
   ['Source','DocProps','-','Save','NewPage','Preview','-','Templates'],
   ['Cut','Copy','Paste','PasteText','PasteWord','-','Print','SpellCheck'],
   ['Undo','Redo','-','Find','Replace','-','SelectAll','RemoveFormat'],
   ['Form','Checkbox','Radio','TextField','Textarea','Select','Button','ImageButton','HiddenField'],
   '/',
   ['Bold','Italic','Underline','StrikeThrough','-','Subscript','Superscript'],
   ['OrderedList','UnorderedList','-','Outdent','Indent'],
   ['JustifyLeft','JustifyCenter','JustifyRight','JustifyFull'],
   ['Link','Unlink','Anchor'],
   ['Image','Flash','Table','Rule','Smiley','SpecialChar','PageBreak','UniversalKey'],
   '/',
   ['Style','FontFormat'],
   '/',
   ['FontName','FontSize'],
   ['TextColor','BGColor'],
   ['FitWindow','-','About']
] ;

Can anybody help me?