function setOpacity(elt, opacity) {
    if (elt.style.opacity != undefined)
        elt.style.opacity = opacity;
    else if (elt.style.filter != undefined)
        elt.style.filter = 'alpha(opacity='+Math.round(100*opacity)+')';
}


function initialisation()
{
  smenu=new Array("ssgamme","ssgamme_fond","ssatlantik_fond","ssatlantik","sscontact","sscontact_fond","fond_news","cont_news");
  for (i=0;i<smenu.length;i++)
  {
      document.getElementById(smenu[i]).style.display='none';
  }
}
function ssmenu(id)
{
  if(id!='')
  {
    div=document.getElementById(id);
    document.getElementById(id+"_fond").style.display='block';
    div.style.display='block';
  }
  else
  {
    initialisation();
  }
}

function video()
{
  document.getElementById('video').removeChild(document.getElementById('pvideo'));
  document.getElementById('video1').style.visibility = 'visible';
}

function show(value)
{
  for(i=1;i<3;i++)
  {
    document.getElementById('video'+i).style.visibility = 'hidden';
  }
  document.getElementById('video'+value).style.visibility = 'visible';
}
function langue(url)
{
  window.location=url+'.html';
}


var j=0;
var interval;

function altern(num)
{
  for(i=0;i<num;i++)
  {
    document.getElementById('foire'+i).style.display='none';
  }
  document.getElementById('foire'+j).style.display='block';
  if(j<num-1)
    j++;
  else
    j=0;
  clearInterval(interval);
  interval = setInterval(function(){altern(num);},5000);
}

var o = 0;
var interval2;
var fond = 0;
function news()
{
  document.getElementById("cont_news").style.display="block";
  document.getElementById("fond_news").style.display="block";
  
  if(o<=0.6 && fond!=1)
  {
    setOpacity(document.getElementById("fond_news"), o)
    fond=1;
    o=0; 
  }
  if(fond==1)
  {
    setOpacity(document.getElementById("fond_news"),0.6);
    setOpacity(document.getElementById("cont_news"),o);
  }
  
  o+=0.1;
  
  clearInterval(interval2);
  if(o<=1)
    interval2 = setInterval("news();",100);
  else
   o=0;
}