if ( document.images )
{
  ra1_on = new Image ( );
  ra1_off = new Image ( );

  ra1_on.src = "images/m1.jpg";
  ra1_off.src = "images/m1_h.jpg";
  
  ra2_on = new Image ( );
  ra2_off = new Image ( );

  ra2_on.src = "images/m2.jpg";
  ra2_off.src = "images/m2_h.jpg";
  
  ra3_on = new Image ( );
  ra3_off = new Image ( );

  ra3_on.src = "images/m3.jpg";
  ra3_off.src = "images/m3_h.jpg";
  
  ra4_on = new Image ( );
  ra4_off = new Image ( );

  ra4_on.src = "images/m4.jpg";
  ra4_off.src = "images/m4_h.jpg";
  
  ra5_on = new Image ( );
  ra5_off = new Image ( );

  ra5_on.src = "images/m5.jpg";
  ra5_off.src = "images/m5_h.jpg";
  
  ra6_on = new Image ( );
  ra6_off = new Image ( );

  ra6_on.src = "images/m6.jpg";
  ra6_off.src = "images/m6_h.jpg";
  
}

function button_on ( imgId )
{
  if ( document.images )
  {
    butOn = eval ( imgId + "_on.src" );
    document.getElementById(imgId).src = butOn;
  }
}

function button_off ( imgId )
{
  if ( document.images )
  {
    butOff = eval ( imgId + "_off.src" );
    document.getElementById(imgId).src = butOff;
  }
}
//-->