function MoveObj(obj)
{
	obj.style.top=obj.offsetTop+obj.MyStepy;
	obj.style.left=obj.offsetLeft+obj.MyStepx;
	if(obj.offsetTop>(document.body.clientHeight-obj.offsetHeight+document.body.scrollTop-step))
	{
		obj.MyStepy=-step;
		obj.style.top=document.body.clientHeight-obj.offsetHeight+document.body.scrollTop-step;
	}
	if(obj.offsetLeft>(document.body.clientWidth-obj.offsetWidth-step))
		obj.MyStepx=-step;
	if(obj.offsetTop<step+document.body.scrollTop)
	{
		obj.MyStepy=step;
		obj.style.top=document.body.scrollTop+step;
	}
	if(obj.offsetLeft<step)
		obj.MyStepx=step;
}