var button_active;
if ( document.images )
{
  navigation1_on = new Image ( );
  navigation1_off = new Image ( );
  navigation2_on = new Image ( );
  navigation2_off = new Image ( );
  navigation3_on = new Image ( );
  navigation3_off = new Image ( );
  navigation4_on = new Image ( );
  navigation4_off = new Image ( );
  
  navigation5_on = new Image ( );
  navigation5_off = new Image ( );
  navigation6_on = new Image ( );
  navigation6_off = new Image ( );
  navigation7_on = new Image ( );
  navigation7_off = new Image ( );
  navigation8_on = new Image ( );
  navigation8_off = new Image ( );
  
  navigation9_on = new Image ( );
  navigation9_off = new Image ( );
  navigation10_on = new Image ( );
  navigation10_off = new Image ( );
  navigation11_on = new Image ( );
  navigation11_off = new Image ( );
  navigation12_on = new Image ( );
  navigation12_off = new Image ( );


  navigation1_on.src = "Images/twitter-NL_over.jpg";
  navigation1_off.src = "Images/twitter-NL.jpg";
  navigation2_on.src = "Images/rss-NL_over.jpg";
  navigation2_off.src = "Images/rss-NL.jpg";
  navigation3_on.src = "Images/facebook-NL_over.jpg";
  navigation3_off.src = "Images/facebook-NL.jpg";
  navigation4_on.src = "Images/newsletter-NL_over.jpg";
  navigation4_off.src = "Images/newsletter-NL.jpg";
  
  navigation5_on.src = "Images/twitter-FR_over.jpg";
  navigation5_off.src = "Images/twitter-FR.jpg";
  navigation6_on.src = "Images/rss-FR_over.jpg";
  navigation6_off.src = "Images/rss-FR.jpg";
  navigation7_on.src = "Images/facebook-FR_over.jpg";
  navigation7_off.src = "Images/facebook-FR.jpg";
  navigation8_on.src = "Images/newsletter-FR_over.jpg";
  navigation8_off.src = "Images/newsletter-FR.jpg";

  navigation9_on.src = "Images/twitter-EN_over.jpg";
  navigation9_off.src = "Images/twitter-EN.jpg";
  navigation10_on.src = "Images/rss-EN_over.jpg";
  navigation10_off.src = "Images/rss-EN.jpg";
  navigation11_on.src = "Images/facebook-EN_over.jpg";
  navigation11_off.src = "Images/facebook-EN.jpg";
  navigation12_on.src = "Images/newsletter-EN_over.jpg";
  navigation12_off.src = "Images/newsletter-EN.jpg";
}

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

function button_off ( imgName )
{
  if ( document.images )
  {
  	if (imgName.substring(10) == button_active){
  		alert("idem");
  	}else{
    		butOff = eval ( imgName + "_off.src" );
    		document[imgName].src = butOff;
    	}
  }
}