function floatdiv(){//网页最后加载这个
//	var floatHtml;
//	floatHtml="<div id='layerObj' onMouseOver='pause_resume();' onMouseOut='start();' style='position:absolute;width:300px;height:300px;background:#f00;'>fsdaf</div>"
//	document.write(floatHtml);
layerObj =document.getElementById("floatLay");
layerObj.style.left= xPos;
layerObj.style.top = yPos;
start();
}

var xPos = 20;
var yPos = 10;
var step = 1;
var delay = 30; 
var width,height,Hoffset,Woffset;
var y = 1;
var x = 1;
var interval;
var layerObj;
function changePos() 
{
  width = document.body.clientWidth;
  height = document.body.clientHeight;
  Hoffset = layerObj.offsetHeight;
  Woffset = layerObj.offsetWidth;
  if (y) 
  {
    yPos = yPos + step;
  }
  else 
  {
    yPos = yPos - step;
  }
  if (yPos < 0) 
  {
    y = 1;
    yPos = 0;
  }
  if (yPos >= (height - Hoffset)) 
  {
    y = 0;
    yPos = (height - Hoffset);
  }
  if (x) 
  {
    xPos = xPos + step;
  }
  else 
  {
    xPos = xPos - step;
  }
  if (xPos < 0) 
  {
    x = 1;
    xPos = 0;
  }
  if (xPos >= (width - Woffset)) 
  {
    x = 0;
    xPos = (width - Woffset);
  }
  layerObj.style.left = xPos + document.body.scrollLeft;
  layerObj.style.top = yPos + document.body.scrollTop;
}

function start() 
{
  interval = setInterval('changePos()', delay);
}

function pause_resume() 
{
    clearInterval(interval);
}
function closeDiv(){
    clearInterval(interval);
    document.documentElement("layerObj").style.display="none";
}