Front shock absorbed forks that will fit a huffy frame

[Parah_Salin]

Hey, I currently have an old huffy that I am I managed to fit an engine to. It's a children's mountain bike, but it dosn't have a shock absorbed fron't fork. I want to put on on so that I don't die too much, I was wondering what would fit it?

 

[Kiwi]

is it a quill stem or a threadless stem. I am guessing it will be a quill stem. This will help with the stem question http://en.wikipedia.org/wiki/Stem_(bike)
Also , what wheel size is it?