Child frame referencing for an Event

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I am creating a chat system. I have a form with just a textarea where the chat message can be entered. I want the form to be submitted when the Enter key is pressed. So I found this script which works nicely when the script is on the same page as the form...

function submitenter(myfield,e)
{
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (e) keycode = e.which;
	else return true;
 
	if (keycode == 13)  {
		alert("Enter was pressed");
		// myfield.form.submit();
		return false;
	}
	else
	return true;
}
 
<textarea onKeyPress="return submitenter(this,event)"></textarea>

The problem is, I want my Javascript function to be located in the parent frameset and there is a child frame called "main" where the chat form goes. Also, the textarea is generated dynamically from that parent frame like this:

var chatTextarea = self.main.document.createElement("textarea");

Then I want to call the submitenter function from the frameset, something like this...

chatTextarea.onclick = function() { return submitenter(this,event) } ;

Trouble is, event is not defined anymore.

Also the line:

if (window.event) keycode = window.event.keyCode;

would reference the wrong page right?

What are the correct frame references? Thanks.