Infinite Menu Problems

Error Scene=Scene 1, layer=Layer 1, frame=1:Line 3: Syntax error.
___xcenter=150;

Error Scene=Scene 1, layer=Layer 1, frame=1:Line 4: Syntax error.
___speed=1/10;

Total ActionScript Errors: 2 Reported Errors: 2

This is what it says when I add the first set of code into the movieclip actions from the Infinite Menu Tutorial. If you could tell me what this means it would help me a lot. Maybe it’s because I am on MX 2004???