Try this:
replace
'theme_advanced_disable' => 'fullscreen'
with
'toolbar1'=> 'bold,italic,underline,bullist,numlist,link,unlink,forecolor,undo,redo'
Also, remove 'teeny' => true,
Try this:
replace
'theme_advanced_disable' => 'fullscreen'
with
'toolbar1'=> 'bold,italic,underline,bullist,numlist,link,unlink,forecolor,undo,redo'
Also, remove 'teeny' => true,