Help! I can't seem to get anything to work!

Hi all I am a novice with actionscript and wish to learn actionscript 3.0 so over the last few days I have been trying to complete some beginner tutorials on how to get things to do something when you click on them. I followed the tutorial to the letter but nothing at all is working when I test the movie. I am using cs4. I then noticed that the tutorial provides the flash file to download so that you can check yours against theirs if youre really getting stuck so I opened it up and THEIRS doesn’t work either, it has the same problems as mine, so I am wondering whether it is something I have done to cause this or something wrong with my settings or whatever.

Here is the code I am using to make an instance of a button symbol (instance name COW) to take me to the facebook website:

COW.addEventListener(MouseEvent.CLICK, buttonClickHandler);
function buttonClickHandler(event:MouseEvent):void {
navigateToURL(new URLRequest(“http://www.facebook.com”));
trace(“I’m clicked”);
}

Here is the code I am using to make an instance of a button symbol (instance name HOME) to take me to the frame named “home”:

HOME.addEventListener(MouseEvent.CLICK, clickHOME);
function clickHOME(event:Event):void {
trace(“It works”);
gotoAndStop(“home”);
}

I have also put a blank layer on top with stop(); on the first frame… but the stop command is not working. Neither mine or the file that the tutorial provides is working, none of the buttons are working and the content is looping over and over, and on MINE, the buttons aren’t even going different colours when I hover over them even though this requires no code. They DO change colour in the stage but not when I test movie! wtf!

Here is the link to the page where I dowloaded the tutorial’s example file:

http://www.vineyardesigns.com/tutorials/flash/website/index.shtml

thanks in advance for any help I have been at this for 3 days now and it is so demoralising that I have not yet managed to get a single thing to work! X