var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,dir,iname) 
{
  var head = document.getElementById(id + '-ddheader');
  var cont = document.getElementById(id + '-ddcontent');
  
  clearInterval(cont.timer);
  if(dir == 1) 
  {
	//  head.style.backgroundColor ="#3B51A3";
	    document.getElementById('gif'+id).src = 'images/'+ iname +'';
    clearTimeout(head.timer);
    if(cont.maxh && cont.maxh <= cont.offsetHeight) {
      return;
    } else if(!cont.maxh) {
      cont.style.display = 'block';
      cont.style.height = 'auto';
      cont.maxh = cont.offsetHeight;
      cont.style.height = '0px';
    }
    cont.timer = setInterval("ddSlide('" + id + "-ddcontent', 1)", DDTIMER);
  } 
  else 
  {
//	  head.style.backgroundColor='#ffffff';
	    document.getElementById('gif'+id).src = 'images/'+ iname +'';
    head.timer = setTimeout('ddCollapse(\'' + id + '-ddcontent\')', 50);
  }
}

// collapse the menu //
function ddCollapse(id) {
  var cont = document.getElementById(id);
  cont.timer = setInterval("ddSlide('" + id + "', -1)", DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown content //
function cancelHide(id,iname) {
	
  var head = document.getElementById(id + '-ddheader');
  var cont = document.getElementById(id + '-ddcontent');
 // head.style.backgroundColor ="#3B51A3";
    document.getElementById('gif'+id).src = 'images/'+ iname +'';
  clearTimeout(head.timer);
  clearInterval(cont.timer);
  if(cont.offsetHeight < cont.maxh) {
    cont.timer = setInterval("ddSlide('" + id + "-ddcontent', 1)", DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(id,dir) {
  var cont = document.getElementById(id);
  var currheight = cont.offsetHeight;
  var dist;
  if(dir == 1) {
    dist = (Math.round((cont.maxh - currheight) / DDSPEED));
  } else {
    dist = (Math.round(currheight / DDSPEED));
  }
  if(dist <= 1) {
    dist = 1;
  }

  cont.style.height = currheight + (dist * dir) + 'px';
  cont.style.opacity = currheight / cont.maxh-0.1;
  cont.style.filter = 'alpha(opacity=' + (currheight * 100 / cont.maxh-10) + ')';
  if((currheight < 2 && dir != 1) || (currheight > (cont.maxh - 2) && dir == 1)) {
  clearInterval(cont.timer);
  }
}