Issues with multiple lined dynamic text fields

when a button is hovered over, i want a dynamic text box to display a message. my frist question: what is the actionscrip that will do this and where do i need to put it. secondly, how do i tell it to print a multilined text. for inscnace, you hover over a button and in a text box appears

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9/9/04
description

…simple, but i dont know how. thansks.