function montre(i) {var bulle = 'bulle'+i; document.getElementById(bulle).style.visibility = "visible";}
function cache(i) {var bulle = 'bulle'+i; document.getElementById(bulle).style.visibility = "hidden";}

document.write('<style type="text/css">');
if (navigator.appName.indexOf("Explorer") > -1)
  { pos_conteneur = 0;}
else
  {pos_conteneur = (screen.width-970)/2;}
  pos_bulle0 = 50 + pos_conteneur; pos_bulle1 = 200 + pos_conteneur; pos_bulle2 = 200 + pos_conteneur;
  pos_bulle3= pos_conteneur; pos_bulle4= pos_conteneur;  
  document.write('#bulle0{ position: absolute; top:190px; left:'+ pos_bulle0 + 'px; width: 920px; height: 440px;background: url(images/accueil/fond_infobulle.jpg); background-repeat:no-repeat; border: 2px inset #000000; visibility: hidden;}');
  document.write('#bulle3{ position: absolute; top:10px; left:'+ pos_bulle3 + 'px; width: 920px; height: 630px;background: url(../images/cours/fond_infobulle.jpg); background-repeat:no-repeat; border: 2px inset #000000; visibility: hidden;}');
  document.write('#bulle1{ position: absolute;top:15px; left:'+ pos_bulle1 + 'px; padding: 0px 0px 0px 0px;border: 2px inset black; visibility: hidden;}');
  document.write('#bulle2{ position: absolute; top:15px; left:'+ pos_bulle2 + 'px; padding: 0px 0px 0px 0px;border: 2px inset black; visibility: hidden;}');
  document.write('#bulle4{ position: absolute; top:15px; left:'+ pos_bulle4 + 'px; padding: 0px 0px 0px 0px;border: 2px inset black; visibility: hidden;}');
  document.write('</style>');