var class_name=function()
{
this.top=500//与顶部距离
//左侧广告
this.l_width=100//宽
this.l_height=100//高
this.l_left=100//与左侧的距离
this.l_src="http://img.baidu.com/img/logo-zhidao.gif"//图片路径
this.l_url="http://www.baidu.com/"//图片链接地址
//右侧广告
this.r_width=100//宽
this.r_height=100//高
this.r_right=100//与右侧的距离
this.r_src="http://img.baidu.com/img/logo-zhidao.gif"//图片路径
this.r_url="http://www.baidu.com/"//图片链接地址
}
var c=new class_name()
document.write('<div id="xf_left_gg" style="position:absolutewidth:'+c.l_width+'pxheigth:'+c.l_height+'pxleft:'+c.l_left+'pxtop:'+c.top+'px"><a href="'+c.l_url+'" target="_blank"><img src="'+c.l_src+'" width="'+c.l_width+'" height="'+c.l_height+'" border="0"></a></div>')
document.write('<div id="xf_right_gg" style="position:absolutewidth:'+c.r_width+'pxheigth:'+c.r_height+'px" right:'+c.r_right+'pxtop:'+c.top+'px"><a href="'+c.l_url+'" target="_blank"><img src="'+c.l_src+'" width="'+c.l_width+'" height="'+c.l_height+'" border="0"></a></div>')
function lxs_xf()
{
var t=(document.body.scrollTop>0)?(parseInt(document.body.scrollTop)+c.top):c.top
$("xf_left_gg").style.left=c.l_left+"px"
$("xf_left_gg").style.top=t+"px"
$("xf_right_gg").style.right=c.r_right+"px"
$("xf_right_gg").style.top=t+"px"
}
function $(id){return document.getElementById(id)}
if(window.attachEvent)
{
window.attachEvent("onload",lxs_xf)
window.attachEvent("onscroll",lxs_xf)
}
else
{
window.addEventListener("load",lxs_xf,false)
window.addEventListener("scroll",lxs_xf,false)
}
</script>
用一段javascript脚本实现的。<DIV id="flt" name="flt" style="right:1pxPOSITION:absolutetop:145pxz-index:99"><img src="images/hl.jpg" ></div>
<script>
var lastScrollY=0
function scro(){
diffY=document.body.scrollTop
percent=.1*(diffY-lastScrollY)
if(percent>0)percent=Math.ceil(percent)
else percent=Math.floor(percent)
document.getElementById('flt').style.pixelTop+=percent//更改坐标
lastScrollY=lastScrollY+percent
}
window.setInterval("scro()",30)
</script>
