flash课件制作“开始”菜单效果

flash课件制作:步骤
详细过程看源文件，这是写在第一帧上的代码：

////////////设置菜单不可见////////////// 
cd_mc._visible = 0; 
////////////“开始”按钮//////////////////// 
ks_btn.onPress = function() { 
if (cd_mc._visible == 0) { 
cd_mc._visible = 1; 
} else { 
cd_mc._visible = 0; 
} 
}; 
/////////////在子菜单外按鼠标//////////////// 
btny_mc.useHandCursor = false; 
btny_mc.onPress = function() { 
cd_mc._visible = 0; 
}; 
/////////////子菜单名与坐标及指示效果//////////////////// 
cd_mc.zs_mc._visible = 0; 
var cd_array:Array = ["动画制作", "图形设计", "在线音乐", "原创教程", "随笔文章", "家庭影集", "给我留言"]; 
for (i=cd_array.length; i>0; i--) { 
cd_mc.zcd_mc.duplicateMovieClip("zcd_mc"+i, i); 
this.cd_mc["zcd_mc"+i]._y = -24*(i-1); 
this.cd_mc["zcd_mc"+i]._txt.text = cd_array[i-1]; 
this.cd_mc["zcd_mc"+i].onRollOver = function() { 
cd_mc.zs_mc._visible = 1; 
cd_mc.zs_mc._y = this._y; 
this._txt.textColor = 0xFFFFFF; 
}; 
this.cd_mc["zcd_mc"+i].onRollOut = function() { 
cd_mc.zs_mc._visible = 0; 
this._txt.textColor = 0x000000; 
}; 
this.cd_mc["zcd_mc"+i].onRelease = function() { 
cd_mc._visible = 0; 
}; 
}