document.write("<div id='adok' style='position:absolute'><a href='http://www.yhjj.gov.cn/newsshow.aspx?artid=3223' target='_blank'><img src=/ad/2010wmjb.jpg border=0></a>"
+"</div>");

  var xxx = 50,yyy = 60
  var xinxx = true, yinxx = true
  var step = 1 
  var delay = 10
  var objxx=document.getElementById("adok") 
  function floatADxx() {
     var L=T=0
     var R= document.body.clientWidth-objxx.offsetWidth
     var B = document.body.clientHeight-objxx.offsetHeight
     objxx.style.left = xxx + document.body.scrollLeft
     objxx.style.top = yyy + document.body.scrollTop
     xxx = xxx + step*(xinxx?1:-1)  
     if (xxx < L) { xinxx = true; xxx = L} 
     if (xxx > R){ xinxx = false; xxx = R} 
     yyy = yyy + step*(yinxx?1:-1) 
     if (yyy < T) { yinxx = true; yyy = T } 
     if (yyy > B) { yinxx = false; yyy = B } 
  }
  var itl= setInterval("floatADxx()", delay) 
 objxx.onmouseover=function(){clearInterval(itl)} 
 objxx.onmouseout=function(){itl=setInterval("floatADxx()", delay)}