网络技术疯人院

以下是一则常见的对联式广告代码,代码如下:

//左边
var left_img='<a href=http://www.is686.com/list.php?u=loveflash target=_blank><img border=0 src=http://www.goutuizi.com/simple/left.gif width=100 height=100></a><br><br><a href=http://w2.001122.com/list.php?u=loveflash target=_blank><img border=0 src=http://www.goutuizi.com/simple/left.gif width=100 height=100></a>';

//右边
var right_img='<a href=http://www.is686.com/list.php?u=loveflash target=_blank><img border=0 src=http://www.goutuizi.com/simple/right.gif width=100 height=100></a><br><br><a href=http://w2.001122.com/list.php?u=loveflash target=_blank><img border=0 src=http://www.goutuizi.com/simple/right.gif width=100 height=100></a>';
var delta=0.05
var collection;
function floaters() {
this.items = ;
this.addItem = function(id,x,y,content)
{
document.write('<DIV id='+id+' style="Z-INDEX: 10; POSITION: absolute; width:80px; height:60px;left:'+(typeof(x)=='string'?eval(x):x)+';top:'+(typeof(y)=='string'?eval(y):y)+'">'+content+'</DIV>');

var newItem = {};
newItem.object = document.getElementById(id);
newItem.x = x;
newItem.y = y;

this.items[this.items.length] = newItem;
}
this.play = function()
{
collection = this.items
setInterval('play()',10);
}
}
function play()
{

for(var i=0;i<collection.length;i++)
{
var followObj = collection.object;
var followObj_x = (typeof(collection.x)=='string'?eval(collection.x):collection.x);
var followObj_y = (typeof(collection.y)=='string'?eval(collection.y):collection.y);

if(followObj.offsetLeft!=(document.body.scrollLeft+followObj_x)) {
var dx=(document.body.scrollLeft+followObj_x-followObj.offsetLeft)*delta;
dx=(dx>0?1:-1)*Math.ceil(Math.abs(dx));
followObj.style.left=followObj.offsetLeft+dx;
}

if(followObj.offsetTop!=(document.body.scrollTop+followObj_y)) {
var dy=(document.body.scrollTop+followObj_y-followObj.offsetTop)*delta;
dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));
followObj.style.top=followObj.offsetTop+dy;
}
followObj.style.display = '';
}
}

var theFloaters = new floaters();
theFloaters.addItem('followDiv1','document.body.clientWidth-110',170,''+right_img+'');
theFloaters.addItem('followDiv2',10,170,''+left_img+'');
theFloaters.play();

把上面的代码复制到一个记事本,以JS形式保存,在DW中调用这个特效,

能显示出对联广告,但现在我想修改它,能随着网页向下拉而向下走动,

要怎么修改,要在那个地方添加代码,请各位帮帮手.
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