having " displayed in a textbox via actionscript

Easy one.

I've forgotton how you display the quotation marks (") in a textbox via actionscript

eg

this.textbox.text = "John said, "Hello I'm John". John was a very simple boy.";

is incorrect.

How do I get AS to recognise the "Hello I'm John" as a part of the sentence rather than it thinking it is a part of a string.

I've had a quick look in LiveDocs but couldnt find it

Thanks in advance.