var DDSPEED = 5;
var DDTIMER = 10;

// main function to handle the mouse events //
function ddMenu(id,d,e){
  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);
//alert(c.style.height+ 'ddColl');
}

// 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);
  c.style.display = 'block';
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
	//alert(c.style.height + 'canHide');
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  	//OPENING FIELD ALWAYS 'ON' TILL MOUSEOVER
  if(d == 1){
	  c.style.display = 'block';
    dist = (Math.round((c.maxh - currh) / DDSPEED));
	 //alert(c.style.height + 'ddSli if == 1');
  	// CLOSING FIELD
  }else{
	 // COLLAPSING THE FIELD - DOES NOT STOP - THAT IS WHY IT NEEDS IF STATEMENT
    dist = (Math.round(currh / DDSPEED));
	   
		if (currh == 4){ // THE HEIGHT GETS STUCK AT 4px THEREFORE:
			//alert('WORKING');
			clearInterval(c.timer);
			c.style.display = 'none';
			//c.style.filter = 'alpha(opacity=' + 0 + ')';
			
		}
	
	 //alert(c.offsetHeight + ' - OFFSET');
	 //alert(c.maxh + ' - MAXH');
	 //alert(c.style.height + ' - C.STYLE.HEIGHT');
  }
  
  //
  if(dist <= 1 && d == 1){
    dist = 1;
	 //alert(c.style.height + 'ddSli if <=');
  }
  
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.MozOpacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  
  // CLEARS THE INTERVAL AFTER THE FIELD HAS OPENED
 	if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}