//Animazione
var DDSPEED = 50;
var DDTIMER = 15;

function ddMenu(id,d){
  var h = document.getElementById(id);
  var c = document.getElementById(id + '-s');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
	c.style.display = 'block';
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
	  if(c.style.height = '0px'){
	  	c.style.display = 'block';
	  }
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

function cancelHide(id){
  var h = document.getElementById(id);
  var c = document.getElementById(id + '-s');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = Math.round((c.maxh - currh) / DDSPEED);
  }else{
    dist = Math.round(currh / DDSPEED);
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  /*c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';*/
  if(currh > (c.maxh+8) && d == 1){
    clearInterval(c.timer);
  }else if(dist < 17 && d != 1){
    clearInterval(c.timer);
    c.style.display = 'none';
	 c.style.height = '0px';
  }
}