How to replace Text using a Textbox in URL (SWF FILE)? (Flash Shockwave Object)

Hello, here today was trying to to embed an swf file (flash-game) for our new flash gaming website. I wanna embed it in my Project as an SWF Flash Wave Object so our members can play it where ever they are...
First I had problems with sendding Keys to my project, but I kinda gave up on that..... Now I am fixing my embedding problem.

Here is an example of our SWF Flash URL:
I am trying to replace the "level=2" with a TextBox Text, but cant make it work! Please notice am not using a WebBrowser but an AxShockwaveFlash reference. I even
tried with a browser, didnt work either..

Here is a way I tried:
I know that the {0} should replace my the text with my textbox but this method is only working only Webbrowsers, and not in SWF. I would be appreciated to know how to replace the last text in the SWF URL..

Thanks a bunch in advance..