or you can visit this website to view Key code values :
http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00001136.html

((NOT ADVERTISING))

i am a newbie my self but i always use google and Flash Help topics to find answers !!
hehe

var mainSpeed:Number = 7;
onEnterFrame = function(){ //this function will run every frame (needed for moving the character
if(Key.isDown(37) || Key.isDown(65)){ //if the “A” key or Left Arrow Key is Down
mcMain._x -= mainSpeed;//then the move the guy left
} else if(Key.isDown(39) || Key.isDown(68)){//if the “D” key or Right Arrow Key is Down
mcMain._x += mainSpeed; //then move the guy to the right
}
mainJump();
}
//JUMPING VARIABLES
//whether or not the main guy is jumping
var mainJumping:Boolean = false;
//how quickly should the jump start off
var jumpSpeedLimit:Number = 15;
//the current speed of the jump;
var jumpSpeed:Number = jumpSpeedLimit;
//THE JUMPING FUNCTION
function mainJump():Void{
//if main isn’t already jumping
if(!mainJumping){
if(Key.isDown(38) || Key.isDown(87)){
//then start jumping
mainJumping = true;
jumpSpeed = jumpSpeedLimit*-1;
mcMain._y += jumpSpeed;
}
} else {
//if we’re already jumping, then continue to do so
if(jumpSpeed -jumpSpeedLimit*.2){
jumpSpeed *= -1;
}
}
if(jumpSpeed > 0 && jumpSpeed = Stage.height – mcMain._height){
mainJumping = false;
mcMain._y = Stage.height – mcMain._height;
}
}
}

var yspeed = 1;
var gravity = 1;
var jump = -8;
onEnterFrame = function () {
mcMain._y += yspeed;
yspeed += gravity;
if(mcMain.hitTest(ground)){
if(Key.isDown(Key.UP)){
yspeed = jump;
} else {
yspeed = 0;
}
}
}