document.write ('<div id="dd" style="position:absolute; left:250px; top:114px; width:100px; height:100px; z-index:1"><a href="http://www.nipc.org.cn/shownews.aspx?id=262" target="_blank"><img src="image/1.jpg" width="200" height="30" border="0"></a></div>');//设置图片长宽及链接
var xPos = 20;//开始漂浮的水平位置
var yPos = document.documentElement.clientHeight?document.documentElement.clientHeight : document.body.clientHeight;//开始漂浮的垂直位置
var step = 1;
var delay = 30;
 var height = 0;
 var Hoffset = 0;
 var Woffset = 0;
 var yon = 0;
 var xon = 0;
 var pause = true;
 var interval;
 var dd=document.getElementById("dd");
 dd.style.top = yPos+"px";
 function changePos() 
 {
 width = document.documentElement.clientWidth?document.documentElement.clientWidth : document.body.clientWidth;
 height = document.documentElement.clientHeight?document.documentElement.clientHeight : document.body.clientHeight;
 Hoffset = dd.offsetHeight;
 Woffset = dd.offsetWidth;
 var sl=document.documentElement.scrollLeft?document.documentElement.scrollLeft:document.body.scrollLeft;
 dd.style.left = xPos + sl+"px";
 var st=document.documentElement.scrollTop?document.documentElement.scrollTop:document.body.scrollTop;
 dd.style.top = yPos + st+"px";
 if (yon)
  {yPos = yPos + step;}else {yPos = yPos - step;}
  if (yPos < 0) 
  {yon = 1;yPos = 0;}
  if (yPos >= (height - Hoffset))
   {yon = 0;yPos = (height - Hoffset);}
   if (xon) 
   {xPos = xPos + step;}else {xPos = xPos - step;}
   if (xPos < 0) 
   {xon = 1;xPos = 0;}
   if (xPos >= (width - Woffset))
    {xon = 0;xPos = (width - Woffset);}
    }
    function start()
    {
    dd.visibility = "visible";interval = setInterval('changePos()', delay);}
    function pause_resume()
     {
     if(pause)
      {clearInterval(interval);pause = false;}else {interval = setInterval('changePos()',delay);pause = true;}
      }
     start();