dynamic even handlers

[amaterasu]

hi

i took a little tutorial on dynamic event handlers but for some reason its not working with me heres the code exactly like in the

tutorial :

goRight=function()
{
if (square._x<300) square._x+=5;
else square.onEnterFrame=goUp;
}

goUp=function()
{
if(square._y>300) square._y-=5;
else square.onEnterFrame=goLeft;
}
goLeft=function()
{
if(square._x>100) square._x-=5;
else square.onEnterFrame=null;
}

i understand you have to place the code on the frame and not on the MC
my mc's instance name is 'square' i use mx 2004

ps im thinking of buying a book on ac and currently im thinking
of buying sitepoints flash anthology for actionscript anyone
have it ? i need a book that will enable me to create my own
scripts in time