var displaymode="always";//"oncepersession"只显示一次，"always"每次显示
var enablefade="yes" //("yes"显示淡入效果, "no"无淡入效果)
var autohidebox=["no", 5] //设置多少称关闭浮动层 ["yes"x秒自动关闭设置有效果"no"无效,即不自动关闭]
var showonscroll="yes" //随滚动条滚动 ("yes"/"no)
var IEfadelength=1 //fade in duration for IE, in seconds
var Mozfadedegree=0.05 //fade in degree for NS6+ (number between 0 and 1. Recommended max: 0.2)
if (parseInt(displaymode)!=NaN)
  var random_num=Math.floor(Math.random()*displaymode)
function displayfadeinbox(){
  var ie=document.all && !window.opera
  var dom=document.getElementById
  iebody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
  objref=(dom)? document.getElementById("fadeinbox") : document.all.fadeinbox
  var scroll_top=(ie)? iebody.scrollTop : window.pageYOffset
  var docwidth=(ie)? iebody.clientWidth : window.innerWidth
  docheight=(ie)? iebody.clientHeight: window.innerHeight
  var objwidth=objref.offsetWidth
  objheight=objref.offsetHeight
  objref.style.left=docwidth/2-objwidth/2+"px"
  objref.style.top=scroll_top+docheight/2-objheight/2+"px"
if (showonscroll=="yes")
  showonscrollvar=setInterval("staticfadebox()", 50)
if (enablefade=="yes" && objref.filters){
  objref.filters[0].duration=IEfadelength
  objref.filters[0].Apply()
  objref.filters[0].Play()
  }
  objref.style.visibility="visible"
  if (objref.style.MozOpacity){
  if (enablefade=="yes")
  mozfadevar=setInterval("mozfadefx()", 90)
  else{
  objref.style.MozOpacity=1
  controlledhidebox()
  }
  }
  else
  controlledhidebox()
  }
function mozfadefx(){
  if (parseFloat(objref.style.MozOpacity)<1)
  objref.style.MozOpacity=parseFloat(objref.style.MozOpacity)+Mozfadedegree
  else{
  clearInterval(mozfadevar)
  controlledhidebox()
  }
  }
function staticfadebox(){
  var ie=document.all && !window.opera
  var scroll_top=(ie)? iebody.scrollTop : window.pageYOffset
  objref.style.top=scroll_top+docheight/2-objheight/2+"px"
  }
function hidefadebox(){
  objref.style.visibility="hidden"
  if (typeof showonscrollvar!="undefined")
  clearInterval(showonscrollvar)
  }
function controlledhidebox(){
  if (autohidebox[0]=="yes"){
  var delayvar=(enablefade=="yes" && objref.filters)? (autohidebox[1]+objref.filters[0].duration)*1000 : autohidebox[1]*1000
  setTimeout("hidefadebox()", delayvar)
  }
  }
function initfunction(){
  setTimeout("displayfadeinbox()", 100)
  }
function get_cookie(Name) {
  var search = Name + "="
  var returnvalue = ""
  if (document.cookie.length > 0) {
  offset = document.cookie.indexOf(search)
  if (offset != -1) {
  offset += search.length
  end = document.cookie.indexOf(";", offset)
  if (end == -1)
  end = document.cookie.length;
  returnvalue=unescape(document.cookie.substring(offset, end))
  }
  }
  return returnvalue;
  }

if (displaymode=="oncepersession" && get_cookie("fadedin")=="" || displaymode=="always" || parseInt(displaymode)!=NaN && random_num==0){
  if (window.addEventListener)
  window.addEventListener("load", initfunction, false)
  else if (window.attachEvent)
  window.attachEvent("onload", initfunction)
  else if (document.getElementById)
  window.onload=initfunction
  document.cookie="fadedin=yes"
  }