function aatime(n)
{
if (n==0)
{ 
document.all.returnDiv.style.display = "none";
document.all.returnTime.style.display = "none";
//²»ÏÔʾ 

} 
else { 
document.all.returnDiv.style.display = "";
document.all.returnTime.style.display = "";
}
}