var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d)
	{
		var h = document.getElementById(id + '-ddheader');
  		var c = document.getElementById(id + '-ddcontent');
  		
  		clearInterval(c.timer);
  	 if (id == 'contacts') 
  			{ 
  				 var bgImage = 'url(../assets/royaumesperdus/images/menu_right.gif)';
  			}
  		else 
  			{ 
  				var bgImage =' url(../assets/royaumesperdus/images/menu_onglet.png)';
  			}
  		
  		if(d == 1)
  		{
    		clearTimeout(h.timer);
    		h.style.color = '#0099cc';
    		h.style.background= bgImage;
      		h.style.backgroundPosition = '0px -33px';
    		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)},DDTIMER);
  		}
  		else
  		{
   				h.style.color = '#FFFFFF';
   				h.style.backgroundPosition = '0px 0px';
   				h.timer = setTimeout( function() { ddCollapse(c) },20);
  		}
}

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

// incrementally expand/contract the dropdown and change the opacity //
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 < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}