Disable "File on my computer"?

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hi, trying set new contribute site , in process of customizing menus , toolbars suit our needs. wondering if there way disable/remove button "file on computer" on "insert link" dialog. if knows of way this, appreciated.

i couldn't find way grayed out, can prevent users uploading files doing this:

1. in menu got edit, administer websites, choose website
2. choose user en roles
3. choose role want adjust en choose edit role settings
4. in role settings choose file placement
5. check reject linked files , insert '0' @ max filesize.

grtz.
hayo


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