var DDSPEED = 3;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d){

  /* fonctionne seulement avec IE7+ */
/*	if(/MSIE (\d+\.\d+);/.test(navigator.userAgent))
	{
		var ieversion=new Number(RegExp.$1);
		if (ieversion <=6)
	//		return;
	}*/

  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');

  if (c == null) // si on a pas de contenu, on fait juste changer le mouseover
  {
	if ( d == 1 )
		h.className = h.className + "over";
	else
		h.className = h.className.substr(0, h.className.length-4);
	return;
  }

  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
	if(c.maxh && c.maxh <= c.offsetHeight){return}
	else if(!c.maxh){
	  c.style.display = 'block';
	  c.style.height = 'auto';
	  c.maxh = c.offsetHeight;
	  c.style.height = '0px';
	}
	c.timer = setInterval(function(){ddSlide(c,1,h)},DDTIMER);
	if ( h.className.substr(h.className.length - 4) != "over" )
		h.className = h.className + "over";
  }else{
	    h.timer = setTimeout(function(){ddCollapse(c,h)},50);
  }
}

// collapse the menu //
function ddCollapse(c,h){
  c.timer = setInterval(function(){ddSlide(c,-1,h)},DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1,h)},DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d,h){
  var currh = c.offsetHeight;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
    c.style.filter = 'alpha(opacity=100)';
  }else{
    dist = (Math.round(currh / DDSPEED));
    c.style.filter = 'alpha(opacity=0)';
	// On change le classover du mainmenu
	if ( h.className.substr(h.className.length - 4) == "over" )
		h.className = h.className.substr(0, h.className.length-4);
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = Math.round(currh / c.maxh);
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}