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);
  }
}

function prMenu(id,d1){
  var h1 = document.getElementById(id + '-prheader');
  var c1 = document.getElementById(id + '-prcontent');

  clearInterval(c1.timer);
	
  if(d1 == 1){
    clearTimeout(h1.timer);
    if(c1.maxh && c1.maxh <= c1.offsetHeight){
		return;
	} else if(!c1.maxh) {
      c1.style.display = 'block';
      c1.style.height = 'auto';
      c1.maxh = c1.offsetHeight;
      c1.style.height = '0px';
    }
    c1.timer = setInterval(function(){prSlide(c1,1)},DDTIMER);

  }else{
    h1.timer = setTimeout(function(){prCollapse(c1)},50);

  }
}

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

function prCollapse(c1){
  c1.timer = setInterval(function(){prSlide(c1,-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);
  }
}

function pr_cancelHide(id){
  var h1 = document.getElementById(id + '-prheader');
  var c1 = document.getElementById(id + '-prcontent');
  clearTimeout(h1.timer);
  clearInterval(c1.timer);
  if(c1.offsetHeight < c1.maxh){
    c1.timer = setInterval(function(){prSlide(c1,1)},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 < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}

function prSlide(c1,d1){
		
  var currh1 = c1.offsetHeight;
  var dist1;
  if(d1 == 1){
    dist1 = (Math.round((c1.maxh - currh1) / DDSPEED));
  }else{
    dist1 = (Math.round(currh1 / DDSPEED));
  }
  if(dist1 <= 1 && d1 == 1){
    dist1 = 1;
  }
  c1.style.height = currh1 + (dist1 * d1) + 'px';
  c1.style.opacity = currh1 / c1.maxh;
  c1.style.filter = 'alpha(opacity=' + (currh1 * 100 / c1.maxh) + ')';
  if((currh1 < 2 && d1 != 1) || (currh1 > (c1.maxh - 2) && d1 == 1)){
    clearInterval(c1.timer);
  }
}