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);
  
	}

}


function ddRightSlide(c,d)
{
 
	var currw = c.offsetWidth;
  
	var dist;
  
	if(d == 1)
	{
    
		dist = (Math.round((c.maxw - currw) / DDSPEED));
  
	}
	else
	{
    
		dist = (Math.round(currw / DDSPEED));
  
	}
  
	if(dist <= 1 && d == 1)
	{
    
		dist = 1;
  
	}
  
	c.style.width = currw + (dist * d) + 'px';
  
	c.style.opacity = currw / c.maxw;
  
	c.style.filter = 'alpha(opacity=' + (currw * 100 / c.maxw) + ')';
  
	if((currw < 2 && d != 1) || (currw > (c.maxw - 2) && d == 1))
	{
    
		clearInterval(c.timer);
  
	}

}