<!--
if (document.images)
{
  var sPath = window.location.pathname;
  var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);
  sPage = sPage.substring(0,sPage.lastIndexOf('.'));

  b1_on = new Image(); 
  b1_off = new Image();
  b1_on.src = './'+sPage+'/button1on.png'; 
  b1_off.src = './'+sPage+'/button1off.png';
  b2_on = new Image(); 
  b2_off = new Image();
  b2_on.src = './'+sPage+'/button2on.png'; 
  b2_off.src = './'+sPage+'/button2off.png';
  b3_on = new Image(); 
  b3_off = new Image();
  b3_on.src = './'+sPage+'/button3on.png'; 
  b3_off.src = './'+sPage+'/button3off.png';
  b4_on = new Image(); 
  b4_off = new Image();
  b4_on.src = './'+sPage+'/button4on.png'; 
  b4_off.src = './'+sPage+'/button4off.png';
  
  b5_on = new Image(); 
  b5_off = new Image();
  b5_on.src = './'+sPage+'/button5on.png'; 
  b5_off.src = './'+sPage+'/button5off.png';
  b6_on = new Image(); 
  b6_off = new Image();
  b6_on.src = './'+sPage+'/button6on.png'; 
  b6_off.src = './'+sPage+'/button6off.png';
  b7_on = new Image(); 
  b7_off = new Image();
  b7_on.src = './'+sPage+'/button7on.png'; 
  b7_off.src = './'+sPage+'/button7off.png';
  b8_on = new Image(); 
  b8_off = new Image();
  b8_on.src = './'+sPage+'/button8on.png'; 
  b8_off.src = './'+sPage+'/button8off.png';
}
//-->
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;
  }
}