Hide away menu help

Ok guys, please see attached for what i am talking about…

I have a menu which i want to be hiden, and when rolled over, i want it to slide out, and back in when rolled out.

I have achieved that much but if u quickly move your mouse over and off the menu it flickers and plays up a bit, its buggy and glitchy and i dont know how to fix it or what is going on, could someone please have a look at it and tell me what i need to do to fix the issue? I imagine it will be something simple.

I will also be looking to add buttons to that movieclip and ive done my research, and found that its not advisable to make buttons inside movieclips, how should i go about doing this… I read somewhere about telltargets? if someone could set this up for me that would be a great starting point.

Thanks in advance