// JavaScript Document

var DDSPEED = 1;
var DDTIMER = 1;

// main function to handle the mouse events //
function ddMenu(id,d)
{
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  if (c != null)
  {
	  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)},DDTIMER);
	  }
  }
}

// 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;
  }
  
  var prcnt = (currh / c.maxh) ;
  
  if(prcnt < .1)
  {
	  prcnt = 0;
  }
  
  if (currh!=0)
  {
	  c.style.height = (currh + (dist * d)) + 'px';
  }
  else
  {
	  if (dist * d != -1)
	  {
	  	c.style.height = (dist * d) + 'px';
	  }
  }
  
//  c.style.opacity = prcnt;
//  c.style.filter = 'alpha(opacity=' + (prcnt * 100) + ')';
  
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1))
  {
    clearInterval(c.timer);
  }
}