Menu with the slide when you roll over the button?

Hello there. I have a project for a client and he wants a menu like this one here http://mellowandyellow.com/en/ with the slide when you roll over the button. All I can get now is this:

ground_mc.[COLOR=#000000]home_mc[/COLOR].[COLOR=#993300]onRollOut[/COLOR] = [COLOR=#993300]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
ground_mc.[COLOR=#000000]home_mc[/COLOR].[COLOR=#000000]slide_home[/COLOR].[COLOR=#000000]tween[/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000FF]"_width"[/COLOR], [COLOR=#000000]0[/COLOR], [COLOR=#000000]0[/COLOR].[COLOR=#000000]5[/COLOR], [COLOR=#0000FF]“easeOutSine”[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]}[/COLOR]

ground_mc.[COLOR=#000000]home_mc[/COLOR].[COLOR=#993300]onRollOver[/COLOR] = [COLOR=#993300]function[/COLOR]COLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]
ground_mc.[COLOR=#000000]follower_mc[/COLOR].[COLOR=#000000]tween[/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000FF]"_y"[/COLOR], ground_mc.[COLOR=#000000]home_mc[/COLOR].[COLOR=#993300]_y[/COLOR]+[COLOR=#000000]3[/COLOR], [COLOR=#000000]0[/COLOR].[COLOR=#000000]5[/COLOR], [COLOR=#0000FF]“easeOutSine”[/COLOR][COLOR=#000000])[/COLOR];
ground_mc.[COLOR=#000000]home_mc[/COLOR].[COLOR=#000000]slide_home[/COLOR].[COLOR=#993300]_alpha[/COLOR] = [COLOR=#000000]100[/COLOR];
ground_mc.[COLOR=#000000]home_mc[/COLOR].[COLOR=#000000]slide_home[/COLOR].[COLOR=#000000]tween[/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000FF]"_width"[/COLOR], [COLOR=#000000]155[/COLOR], [COLOR=#000000]0[/COLOR].[COLOR=#000000]5[/COLOR], [COLOR=#0000FF]“easeOutSine”[/COLOR][COLOR=#000000])[/COLOR];
[COLOR=#000000]}[/COLOR]
And this is not good. Because if you roll fast over the buttons you can’t see the slide like on that link. Please help me.
Thank you.