Get the variable's contents and then split it with a space.
Code:
var stuff=textbr.split(" ");
Then rejoin everything with a hard return included.
Code:
textbr=stuff[0]+ " " + stuff[1]+"\n"+stuff[2]+ " " + stuff[3]+ " " +stuff[4]+ " " +stuff[5];
Or you could also try substring, if you want the hard line return to after a specific piece of text.
Code:
var stuff=textbr.substring(0,14);
var stuff1=textbr.substring(15,textbr.length);
textbr=stuff+"\n"+stuff1;
I'm sure there are many other ways to attempt this as well and probably someone else can do it much more elegantly than what I've suggested, but this should at least get you thinking about it.