Put a picture(like .png)into Composition Window .

Hi,everybody!

Firstly,i have to admit that I did a 'stupid' thing...I am trying to do a simple plugin for 'play'...

Now,i am getting in the trouble.  So i come here for some help.

I want to konw how i can let my plugin put a picture(i have edited) into composition window.(like the plugin'Optical Flares', but i just let my plugin put one picture.)

And i can do some simple adjustment(such as width,height,center).

I am puzzled about the code.If someone can provide an example or way,it will be very helpful.

(I am a CS5 user)

Thank You!