Player movement and sprites

I notice "TImage" is referred to a lot by the BlitzMax community. Is there something special about that particular variable name? I tried typing it and it did not highlight itself, so I highly doubt the possibility of it being a built-in variable with BlitzMax, something I heard from a tutorial website.

Without further ado, here is the new 'player' type, used in the functional version of my code:

' Create the player type
Type t_player
	Field x_pos: Int' x_pos is an integer
	Field y_pos: Int' y_pos is an integer
	Field c_frame: Int' the current frame of the sprite
	Field c_state: spr_s' the current sprite (spr_s for now)
End Type

If I should replace "c_state" with "TImage then please let me know.

EDIT: I tried defining and calling functions the old BlitzBasic way, but it failed. My style of coding usually involves a very sparse main loop which mainly just calls the proper functions to do more complex actions such as updating the sprite, checking collisions, etc. and ideally I would update the animations/sprites in a function rather than in the main loop...that is just my style, that's all.

If you can tell me how to properly use functions in BlitzMax then I'm greatly appreciate it :)