var no = 5;

  var ns4up = (document.layers) ? 1 : 0;
  var ie4up = (document.all) ? 1 : 0;

  
  if (ns4up) {
    doc_width = self.innerWidth;
    if (self.outerHeight>self.innerHeight)
      doc_height = self.outerHeight;
    else
      doc_height = self.innerHeight;
  } else if (ie4up) {
    doc_width = document.body.clientWidth;
    if (document.body.scrollHeight>document.body.clientHeight) 
      doc_height = document.body.scrollHeight;
    else
      doc_height = document.body.clientHeight;
  }

 
    if (ns4up) { 
      document.write("<layer name=\"bar0\" left=\"15\" top=\"15\" visibility=\"show\">清屏 极大 关闭</layer>");
    } else if (ie4up) {
      document.write("<div id=\"bar0" style=\"POSITION: absolute; Z-INDEX: 0; VISIBILITY: visible; TOP: 15px; LEFT: "+y_len+"px;\">清屏 极大 关闭</div>");
    }
  
  function movebar() {
    if ((self.innerWidth+self.pageXOffset-document.layers['bar0'].left)>170){document.layers['bar0'].left=document.layers['bar0'].left+10}
    else if ((self.innerWidth+self.pageXOffset-document.layers['bar0'].top)<150){document.layers['bar0'].left=document.layers['bar0'].left-10}
    else {document.layers['bar0'].left=self.innerWidth+self.pageXOffset-160}
    if ((document.layers['bar0'].top-self.pageYOffset)<0){document.layers['bar0'].top=document.layers['bar0'].top+10}
    else if ((document.layers['bar0'].top-self.pageYOffset)>20){document.layers['bar0'].top=document.layers['bar0'].top-10}
    else {document.layers['bar0'].top=self.pageYOffset+10}
 }

  function movebar() { 
    if ((document.body.clientWidth+document.body.scrollLeft-document.all['bar0'].style.pixelLeft)>170){document.all['bar0'].style.pixelLeft=document.all['bar0'].style.pixelLeft+10}
    else if ((document.body.clientWidth+document.body.scrollLeft-document.all['bar0'].style.pixelLeft)<150){document.all['bar0'].style.pixelLeft=document.all['bar0'].style.pixelLeft-10}
    else {document.all['bar0'].style.pixelLeft=document.body.clientWidth+document.body.scrollLeft-160}
    if ((document.all["bar0"].style.pixelTop-document.body.scrollTop)<0){document.all["bar0"].style.pixelTop=document.all["bar0"].style.pixelTop+10}
    else if ((document.all["bar0"].style.pixelTop-document.body.scrollTop)>20){document.all["bar0"].style.pixelTop=document.all["bar0"].style.pixelTop-10}
    else {document.all["bar0"].style.pixelTop=document.body.scrollTop+10}
  }