var DDSPEED = 8;
var DDTIMER = 10;

// 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 && h.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
	  c.maxh = c.offsetHeight;
      c.style.height = '0px';
	  /* alert ('h.width '+h.offsetWidth+' c.width '+c.offsetWidth);*/
	  if (h.offsetWidth >= c.offsetWidth) {
		  c.style.width = h.offsetWidth+"px";
	  }
	  if (c.offsetLeft+c.offsetWidth >= 665) {//alert (c.offsetLeft+c.offsetWidth);
		c.style.right = 2+"px";
	  }
    }
    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); 
  
}
function hideMenu () {
	alert ("hide");
	h.timer = setTimeout(function(){c.style.height = '0px';},50);
	
}

// 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.overflow = 'visible';
  }
  if(dist <= 1 && d != 1){
    dist = 1;
	c.style.height = '0px';
	c.style.overflow = 'hidden';
  }

  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);
	
  }
}