image0off = new Image();
imagenav1 = new Image();
imagenav2 = new Image();
imagenav3 = new Image();
imagenav4 = new Image();
imagenav5 = new Image();
imagenav1.src = '/images/nav2.jpg';
imagenav2.src = '/images/nav4.jpg';
imagenav3.src = '/images/nav6.jpg';
imagenav4.src = '/images/nav8.jpg';
imagenav5.src = '/images/nav10.jpg';
image0off = new Image();
imagenav1on = new Image();
imagenav2on = new Image();
imagenav3on = new Image();
imagenav4on = new Image();
imagenav5on = new Image();
imagenav1on.src = '/images/nav2_on.jpg';
imagenav2on.src = '/images/nav4_on.jpg';
imagenav3on.src = '/images/nav6_on.jpg';
imagenav4on.src = '/images/nav8_on.jpg';
imagenav5on.src = '/images/nav10_on.jpg';

function switch_state(img,state){
  if(state == "on"){
    document.getElementById(img).src = '/images/'+img+'_on.jpg';
  }
  else{
    document.getElementById(img).src = '/images/'+img+'.jpg';
  }
}

function showDiv(which){
  for(i=1;i<=5;i++){
    if(i == which){
      document.getElementById(i+'_on').style.display = 'block';
    }
    else{
      document.getElementById(i+'_on').style.display = 'none';
    }
  }
}