Custom button message response - how to have carriage return - new line.

Custom button message response - how to have carriage return - new line.

Simple question...I have a Custom button I have added to a module.  I am returning a message via the return statement.  What do I add to the return string to break it up into multiple lines.

EG:

sResult = "Line1" + "Line2" + "Line3";
return sResult;

How do I change the first statement so that the message reads...

Line1
Line2
Line3

instead of

Line1Line2Line3