var DDSPEED = 5;
var DDTIMER = 5;

// main function to handle the mouse events //
//function ddMenu(id,d,home,nul,path,num)
function ddMenu(id,d)
{
 
//se sto uscendo del menu devo ripristinare 
//  if(d=='-1')
//  {
//    MM_swapImgRestore();
//  }
//  if(d=='1')
//  {
//    MM_swapImage(home,nul,path,num);
//  }
  
  
  //se stiamo uscendo dal menu a tendina dobbiamo ripristinare la icona "non premuta"
//  if(nul==1)
//  {
//    //window.alert("se stiamo uscendo dal menu a tendina dobbiamo ripristinare la icona non premuta"); 
//  }

  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  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)},DDTIMER);
  }
  else
  {
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// 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);
  }
}






/*codice per il caricamento dei button*/
function MM_swapImgRestore() 
{ //v3.0
  var i,x,a = document.MM_sr; 
  for( i=0 ; a&&i<a.length&&(x=a[i])&&x.oSrc; i++) 
	x.src=x.oSrc;
}

//funzione di precaricamento delle immagini
function MM_preloadImages() 
{ //v3.0
  var d = document; 
  if( d.images )//se abbiamo delle immagini
  { 
	if( ! d.MM_p ) 
		d.MM_p = new Array();
    var i , j = d.MM_p.length , a=MM_preloadImages.arguments; 
	for( i=0; i<a.length; i++ )
		if ( a[i].indexOf("#") !=0 )
		{ 
			d.MM_p[j] = new Image; 
			d.MM_p[j++].src = a[i];
		}
   }
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() 
{ 
  var i,j=0,x,a=MM_swapImage.arguments; 
  document.MM_sr = new Array; 
  for( i=0 ; i<(a.length-2) ; i+=3 )
   if ((x=MM_findObj(a[i]))!=null)
   {
        document.MM_sr[j++]=x; 
        if(!x.oSrc) 
            x.oSrc=x.src; 
         x.src=a[i+2];
     }
}