var xPos = 0;
var yPos = 0; 
var step = 3;
var delay = 30;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
var fudongDiv_js;
function changePos(){
	width = document.body.clientWidth;
	height = document.body.clientHeight;
	Hoffset = fudongDiv_js.offsetHeight;
	Woffset = fudongDiv_js.offsetWidth;
	fudongDiv_js.style.left = xPos + document.body.scrollLeft;
	fudongDiv_js.style.top = yPos + document.body.scrollTop;
	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(obj){
	obj.visibility = "visible";
	fudongDiv_js = obj;
	fudongDiv_js.style.top = yPos;
	interval = setInterval('changePos()', delay);
}
function pause_resume(){
	if(pause){
		clearInterval(interval);
		pause = false;
	}else{
		interval = setInterval('changePos()',delay);
		pause = true; 
	}
}