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(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 <= 4 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    if(d != 1){
        c.style.height = '0px';
        c.style.opacity = '0';
       c.style.filter = 'alpha(opacity=0)';
    }
    clearInterval(c.timer);
  }
}

// Added by Andrew Kalek from anlek.com
// DropDown menu picker
function dd_picked(menu_id, selected_object, hidden_field){
	var h = document.getElementById(menu_id + '-ddheader');
	if(selected_object != null){
		var obj = document.getElementById(selected_object);
		if(obj != null){
			
			if(h != null){//Set selected name
				h.innerHTML = obj.innerHTML;
			}else{
				alert("Cant find " + menu_id + "-ddheader");
			}
			
			//set hidden value to id
			var hv = null;
			if(hidden_field != null){ //Picking Correct Hidden Field
				hv = document.getElementById(hidden_field);
			}else{ //Or default to naming convention
				hv = document.getElementById(menu_id + '-ddvalue');
			}
			if(hv != null){
				var id = selected_object.split('-')[1];
				hv.value = id;
			}else{
				alert("Unable to find hidden value for dropdown " + menu_id);
			}
			ddMenu('one',-1);
		}
	}else{
		alert("Unable to find id");
	}
}