var DDSPEED = 2;
var DDTIMER = 15;

function ddMenu(id, d) {
    try {
        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);
        }
    } catch (e) { }
}

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


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);
  }
}


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);
  }
}