//requires prototype.js
//parts of Peter-Paul Koch's excellent quirksmode
//rest of a script I found without copyright.

var DDSPEED = 5;
var DDTIMER = 10;

function findPosX(obj)
  {
    var curleft = 0;
    if(obj.offsetParent)
        while(1) 
        {
          curleft += obj.offsetLeft;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.x)
        curleft += obj.x;
    return curleft;
  }

function findPosY(obj)
  {
    var curtop = 0;
    if(obj.offsetParent)
        while(1)
        {
          curtop += obj.offsetTop;
          if(!obj.offsetParent)
            break;
          obj = obj.offsetParent;
        }
    else if(obj.y)
        curtop += obj.y;
    return curtop;
}

function ddMenu(id,d){
  var h = $(id + '-ddheader');
  var c = $(id + '-ddcontent');
  //added by GC - get the header dimensions
  var dimensions = $(h).getDimensions(); 
  var hWidth = dimensions.width;
  var hHeight =  dimensions.height;
  
  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';
	  //added by GC - places menu on header's position
	  c.style.left = findPosX(h) + 'px';
	  c.style.top = findPosY(h) + hHeight + 'px';  
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
	//added by GC - Removes the class
	h.className = ''; 
  }

}

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

function cancelHide(id){
  var h = $(id + '-ddheader');
  var c = $(id + '-ddcontent');
  //added by GC - Keeps the class active
  h.className = 'active'; 
  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;

  if (currh < 5 && d != 1) {
  	c.style.display = 'none';
  }
 else {
  	c.style.display = 'block';
  }
  
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}