Programmatically show soft keyboard on iPhone in a PhoneGap application?

I've been searching far and long, and to this moment, I did not come across a working solution for PhoneGap / Cordova applications that would show soft keyboard programmatically.

Scenario:

We have a PhoneGap application - a website created in jQuery Mobile - that at one point shows a dialog to the user. This dialog is also a web page and has one single INPUT text box where user should enter a code.

Problem:

When the code dialog is shown, the input box is focused using JavaScript. However, due to restrictions placed on iPhone's internal browser, the soft keyboard does not come up until the user actually really clicks inside the input text box.

What we tried:

• creating a hidden text box and making it first responder
• making the actual webview a first responder once the input receives focus via JavaScript
• using sendActionsForControlEvents to try and delive Touch events to the webview (although if anyone has a working code for a PhoneGap application, I would appreciate if they could share it, since I'm no professional in iOS coding)

Any ideas?

EDIT: The restriction mentioned in this question is for built-in browsers only... if you're aiming Opera, you will be successful by using the following code:

var e = jQuery.Event("keydown", { keyCode: 37 });
$('#element').focus().trigger(e);

EDIT2: This is a final working PhoneGap code that can be used in a plugin:

keyboardhelper.h

//
//  keyboardHelper.h
//  soft keyboard displaying plugin for PhoneGap
//
//  Copyright 2