var objBody = document.getElementsByTagName("body").item(0);
var objFudong = document.getElementById("fudong");
	objFudong.style.position = 'absolute';
    objFudong.style.top = '100px';
    objFudong.style.right = '1px';
var objImg = document.getElementById("fudongimg");

var imgW = parseInt(objImg.width);

function permute (Top,left){
	//var fudong = document.getElementById('fudong');
	var realtop =parseInt(document.documentElement.scrollTop);
	buyTop = Top +  realtop;
	objFudong.style.top = buyTop;
	var buyLeft = parseInt(document.body.scrollLeft)+parseInt(document.body.clientWidth)-imgW;
	//fudong.style.left =buyLeft - left;
}
setInterval('permute(60,20)',1);