How to add a button to Formular in Admin-Panel that opens a popup?

  • Hello,
    I’d like to write a plugin, that can add text to the formular in the Page/Article-Create/Edit Formular in the Admin-Panel. Therefore, I’d like to have a button (such as the “Link a post” button or something), that opens a new window, where the user can choose from a list, what to add.
    Is there still a function in wordpress? Use version 3.x

    Could you please help me? Hope you understand my english, I’m from Germany and just had english in school ??

    Thank you!!

    Johannes

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