2D TileMap Scrolling

Okay I know this isn't a 3D question, but I use Blitz3D

Anyways, Im trying to come up with a better and yet smoother way to do scrolling, basicly I have it incressing the MapX and MapY when the play reaches a certain point on the screen, and I just move the map underme, but for some reason it seem to be to restrected.. so im looking for a smoother and more open scroll..

:EDIT: thought about it I want to be able to foces the camera ( view on the player ) and have the map move along with him..

I think you should do something like:

playertilex=int(player_x/tilewith)
playertiley=int(player_y/tileheight)
for a=playertilex-aconstant1 to playertilex+aconstant2
for b=playertiley-aconstant3 to playertiley+aconstant4
  drawimage maptile(a,b),a*tilewith-player_x+~½screenwith,b*tileheight-player_y+~½screenwith
next
next
drawimage player,~½screenwith,~½screenheight

You'll need to alter this code to fit into your program, I have presumed that you use an array to store the map data.