Adding jquery at a modules backend

[isengartz]

Hello this is the current state of a module im currently making:
http://imgur.com/iCUs0Ye
The user select the names and photos of a dropdown list from backend and in frontend those names and photos get posted.
The module working fine i just wanted to add 2 more fields in where i will show the count of names the user selected, and a textarea where every time a name is selected it will be shown there.
I need only the methodology of how to add jquery in the backend. Im in a kinda good way but i stucked so if someone could tell me what i do wrong i would appreciate it.
THe codes:
http://pastebin.com/UjFS0dfb

[jcms]

add jquery library and use some event().
You can zip module and give here, we can check easily.

[isengartz]

Could you give an example like what events should i add ?

[jcms]

you must check your event in your form, then can get more from here: http://api.jquery.com/