将按钮控制的左右滚动，改为上下滚动。

Question

 <script type="text/javascript">
var goods_gallery=new Marquee("goods_gallery");
goods_gallery.Direction="left";
goods_gallery.Step=0;
goods_gallery.Width=270;
goods_gallery.Height=80;
goods_gallery.Timer=20;
var turnleft = document.getElementById("gleft");
var turnright = document.getElementById("gright");
goods_gallery.Start();
turnleft.onmouseover=function(){goods_gallery.Direction=2}
turnleft.onmouseout=turnleft.onmouseup=function(){goods_gallery.Step=goods_gallery.BakStep}
turnleft.onmousedown=turnright.onmousedown=function(){goods_gallery.Step=goods_gallery.BakStep+10}
turnright.onmouseover=function(){goods_gallery.Direction=3}
turnright.onmouseout=turnright.onmouseup=function(){goods_gallery.Step=goods_gallery.BakStep}
    </script> 

Answer 1

direction 表示滚动的方向，值可以是left，right，up，down，默认为left