Menu w/ slider not keeping _down state

Hi again,

I have another problem with my menu for my office. I looked at nathan99’s tutorial and applied it to my menu it seems to be fine but it does hold the over state unless I press the button twice. Is there something wrong with my actionscript? I don’t think its a typo. I’ll appreciate any help or advice.
I have attached a swf to this and will attach a .fla in another post.

Thank you very much,

T