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);
  }
}



// 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;
  }

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);
  }
}