Braking lines on dynamic text field


I´m using the following code to change the data on a dynamic text filed, where “units” is my text field name.
I´d like to make the lines to brake so the text 2 is under text1, text 3 is under text 2 and text 4 is under text 3.

[AS]on (rollOver) {
units=“text1 text2 text3 text4”

Any help?