function display(obj,one,two)
{
  var e=document.getElementById(obj);
  e.className=(e.className==two)?one:two;
}
function toggle(panel)
{
 display('toggle_'+panel,'grayShow','grayHide');
 display(panel+'_show','grayShow','grayHide');
 display(panel+'_hide','grayShow','grayHide');
}