function process_form(subscribe_form){

	var js_email = escape(subscribe_form.email.value);

	if (js_email != ""){

		var url = "subscribe/check_sub.php?email=" + js_email;

		result_frame = window.open(url,'result_frame','width=500,height=500,scrollbars=1,resizeable=0,toolbar=0,location=0,status=0');

	}

	if (js_email == ""){

		alert ("Please enter email address");

	}       // end invalid email

}       // end function process_form