function ImageButton1_onClick() {
var thisfname = window.location.href;
if(thisfname.indexOf('_IE4') >= 0 || thisfname.indexOf('_40') >= 0 || thisfname.indexOf('_Nav3') >= 0 || thisfname.indexOf('_Gen') >= 0)
{
  window.history.go(-2);
}
else
{
  window.history.back();
}
 }
function _ImageButton1_onClick() { if (ImageButton1) return ImageButton1.onClick(); }