[R] How do I insert a newline in my title in a plot?

[Christos Rodopoulos]

 Hello, I want to help me with a simple I think question: How do I insert a
newline into the title of a plot I have made? 

 Is it only done with hershey fonts? vfont = ??? and so on? I do not
understand Hershey fonts, and I am afraid to use them, since I use greek
fonts (iso8859-7).

 I need propably something like: title("This is a title\nIn 2 lines");

 any help?