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){
	  //alert(d)
    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{
	  //close
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// collapse the menu //
function ddCollapse(c){ 
//var ii = 1ii = ii+1;$('debugj').update(ii);
  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 //
var ii = 0
function ddSlide(c,d){
	ii = ii+1
	var off = 0
	if (document.all){
  var currh = c.offsetHeight;
	}else{
	//$('debugj').update("MOZ");	
	 var currh = c.offsetHeight;	
	off = 0;
		}
  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;
  }
  
 //$('debugj').update("<br>"+ii+":"+currh+":"+dist+":"+(currh + (dist * d))+":"+c.maxh+":"+d);
  
  c.style.height = currh + ((dist * d)-off) + '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)){
	  //alert("clear");
    clearInterval(c.timer);
  }
}