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);
 

 }
}