Send variables to the ASP page

1

I have problem:
I send the variables and I need to prevent SWF not open new window in browser.
I tried to use “_self” parameter, but the window is still open.
Why?

                SendMail = new LoadVars();
			SendMail.email = email_txt.text;
			SendMail.subject = subject_txt.text;
			SendMail.body = body_txt.text;
			SendMail.send("forms/send_mail.asp", "_self", "POST");
			trace("checked = "+checked);
			trace("variables sended to the ASP page");
			email_txt.text = "";
			subject_txt.text = "";
			body_txt.text = "";