function showhide(id1)
{
if (document.getElementById(id1).style.height == "1px")

{
document.getElementById(id1).style.height = "100%";
document.getElementById(id1).style.visibility = "visible";
}
else
{
  document.getElementById(id1).style.height = "1px";
  document.getElementById(id1).style.visibility = "hidden";
  }
}