一个鼠标效果，代码简单易懂，效果不错的

var posYoubiao:Array = new Array(); 
posYoubiao[0] = 5; 
for (i=1; i<6; i++) { 
        //预先设置好游标的位置 
        posYoubiao[i] = 5+(i)*95; 
} 
function youbiaoMotion(no:Number) { 
        youbiaoTarget = posYoubiao[no]; 
        //从预先算好的游标位置中取得当前游标的坐标位置 
        youbiao0.onEnterFrame = function() { 
                youbiao0._x = youbiao0._x+(youbiaoTarget-youbiao0._x)*0.2; 
                if (Math.abs(youbiaoTarget-youbiao0._x)<=0.2) { 
                        youbiao0._x = youbiaoTarget; 
                        delete this.onEnterFrame; 
                } 
        }; 
}

//////////////按钮事件/////////////


for (i=0; i<6; i++) { 
        this["topMenu_btn"+i].no = i; 
        this["topMenu_btn"+i].useHandCursor = false; 
        this["topMenu_btn"+i].onRollOver = function() { 
                if (nowYoubiao != this.no) { 
                        youbiaoMotion(this.no); 
                } 
        }; 
        this["topMenu_btn"+i].onRelease = function() { 
                //鼠标点击事件 
        }; 
}
////////////////////////