使用<！DOCTYPE会使最常用对联漂浮广告失效的解决方案
OK，在使用以下声明时，会使一个最常用的漂浮下拉广告失效
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="
http://www.w3.org/1999/xhtml">
直接导致document.body.scrollTop永远等于0， body Scroll永远也不会引发。搜索了一下，发现了解决方案。
即是使用：document.documentElement.scrollTop 替代 document.body.scrollTop
点这里查看老外的详细分析
以下是正确的漂浮广告下拉代码，在所谓的"W3C标准"里可以正确运行
引用:
var delta=0.15
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:100px; height:450px;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.documentElement.scrollTop+followObj_y)) {
var dy=(document.documentElement.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-108’,1,’<a href=\"http://sms.tom.com/pkly/pkly.html\" target=\"_blank\" /><img border=0 src=\"http://smsad.tom.com/smsweb/images/2005_new/cn/qp_100x400.gif\" width=\"100\" height=\"400\" /></a>’);
theFloaters.play();
