1151: A conflict exists with definition direction in namespace internal.

Question

Hello everyone, i'm a newbie in flash so be cool and patient...
for my final project in college i'm doing a site in which i have scroll buttons (Scroll up and downs)..i use those buttons on more than one page and differently...so i copy pasted the same actions of one pasted for the other and changed the names accordingly..and i got this error...i researched for a solution and found out that i can't put to "var" that are the same...so for the second i took out...gona show u how my codes were and how they are now :
b12.buttonMode=true;
b22.buttonMode=true;
b12.addEventListener(MouseEvent.MOUSE_DOWN, scrollDown);
b22.addEventListener(MouseEvent.MOUSE_DOWN, scrollUp);
b12.addEventListener(MouseEvent.MOUSE_UP, stopScroll);
b22.addEventListener(MouseEvent.MOUSE_UP, stopScroll);
var direction = "";
txtgam.addEventListener(Event.ENTER_FRAME, keepScrolling);
function keepScrolling(e)
          if(direction == "down") {
                    if(txtgam.y > -400){
                              txtgam.y = txtgam.y - 10;
          if(direction == "up") {
                    if(txtgam.y < 25){
                              txtgam.y = txtgam.y +25;
function scrollUp(e)
          direction = "down";
function stopScroll(e)
          direction = "";
function scrollDown(e)
          direction = "up";
to change i just erased "var" in var direction ="";
now i got another problem :
Scene 1, Layer 'actions', Frame 147, Line 42
1021: Duplicate function definition.
about
scrollUp       stopScroll         scrollDown
so i changed and put 2 after each word and i got another problem :
TypeError: Error #1009: Cannot access a property or method of a null object reference.
          at Flashfinal_fla::MainTimeline/keepScrolling()
please help

Answer 1

this is the code now....without var it worked but gave me the #1009..now with var it's giving me
Scene 1, Layer 'actions', Frame 147, Line 17
1151: A conflict exists with definition direction in namespace internal.
b12.buttonMode=true;
b22.buttonMode=true;
b12.addEventListener(MouseEvent.MOUSE_DOWN, scrollDown);
b22.addEventListener(MouseEvent.MOUSE_DOWN, scrollUp);
b12.addEventListener(MouseEvent.MOUSE_UP, stopScroll);
b22.addEventListener(MouseEvent.MOUSE_UP, stopScroll);
var direction = "";
txtgam.addEventListener(Event.ENTER_FRAME, keepScrolling2);
function keepScrolling2(e)
          if(direction == "down") {
                    if(txtgam.y > -270){
                              txtgam.y = txtgam.y - 10;
          if(direction == "up") {
                    if(txtgam.y < 25){
                              txtgam.y = txtgam.y +25;
function scrollUp2(e)
          direction = "down";
function stopScroll2(e)
          direction = "";
function scrollDown2(e)
          direction = "up";