if ( document.images )
{
  go_on = new Image ( );
  go_off = new Image ( );

  go_on.src = "http://i.i.com.com/cnwk.1d/i/hdft/search_go_on.gif";
  go_off.src = "http://i.i.com.com/cnwk.1d/i/hdft/search_go_off.gif";
  
  log_on = new Image ( );
  log_off = new Image ( );

  log_on.src = "http://i.i.com.com/cnwk.1d/i/hdft/search_go_on.gif";
  log_off.src = "http://i.i.com.com/cnwk.1d/i/hdft/search_go_off.gif";
}

function btn_on ( imgName )
{
  if ( document.images )
  {
    btnOn = eval ( imgName + "_on.src" );
    document[imgName].src = btnOn;
  }
}

function btn_off ( imgName )
{
  if ( document.images )
  {
    btnOff = eval ( imgName + "_off.src" );
    document[imgName].src = btnOff;
  }
}