replace char on keypress?

[homerUK]

is there a way to set an "OnkeyPress" event to detect when the return or enter button is pressed, then to insert some text when it is?

I have an iFrame used for a WYSIWYG editor, but when the user presses "Return" it enters a <p> tag to the HTML... I want it to enter a <BR>...

So I thought that I could do some sort of JS which will detect when the enter is pressed and insert "<BR>" instead of <P>

any ideas?!

Thanks,