var x = 50,y = 60;
var xin = true, yin = true;
var step = 1 ;
var delay = 30;
var piaofu_obj=document.getElementById("wrf_piaofu") ;
function floatAD() {
	var L=T=0;
	var R= document.body.clientWidth-piaofu_obj.offsetWidth;
	var B = document.body.clientHeight-piaofu_obj.offsetHeight;
	var xx = x + document.body.scrollLeft;
	var yy = y + document.documentElement.scrollTop;
//	var yy = y + document.body.scrollTop;
	piaofu_obj.style.left = xx + "px";
	piaofu_obj.style.top = yy + "px";
	x = x + step*(xin?1:-1) ;
	if (x < L) { xin = true; x = L;} 
	if (x > R){ xin = false; x = R;} 
	y = y + step*(yin?1:-1) ;
	if (y < T) { yin = true; y = T; } 
	if (y > B) { yin = false; y = B; } 
}
var itl= setInterval("floatAD()", delay) ;
piaofu_obj.onmouseover=function(){clearInterval(itl);} 
piaofu_obj.onmouseout=function(){itl=setInterval("floatAD()", delay);}
function closepf(){
	piaofu_obj.style.visibility='hidden';
	piaofu_obj.innerHTML="";
}