[otrs] different widths for the Agents and the customers in "TextAreaNote" and "TextAreaEmail"

We need to have different widths for the Agents and the customers : "TextAreaNote" and "TextAreaEmail" The reason for this is that the customers have a frontend that is much more narrow than the frontend for the agents. The Agents need a widt of about 130 and the Customers a width of about 80. Is there a way to do this? Anders S. Lyng