var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d){
 if (id == 'read' || navigator.appName.toLowerCase().match("internet explorer") == null){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    c.style.display = 'block';
    if (navigator.appName.toLowerCase().match("internet explorer") != null && (navigator.appVersion.toLowerCase().match("msie 7") != null || navigator.appVersion.toLowerCase().match("msie 6") != null || navigator.appVersion.toLowerCase().match("msie 5") != null)){
        if (c.id.toLowerCase().match("read") != null){
            c.style.margin = '32px 0 0 -185px';
        }
        else {
            c.style.margin = '0 0 0 0';
        }
    }
    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){
 if (c.id == 'read-ddcontent' || navigator.appName.toLowerCase().match("internet explorer") == null){
    c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
  //c.style.display = "none";
  }
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
 if (id == 'read' || navigator.appName.toLowerCase().match("internet explorer") == null){
  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){
 if (c.id == 'read-ddcontent' || navigator.appName.toLowerCase().match("internet explorer") == null){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    currh -= 1;
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  try {
    c.style.height = Math.round(currh + (dist * d)) + 'px';
  }
  catch (ex) {
    if(currh + (dist * d) < 0){
        c.style.height = "0px";
    }
  }
  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);
  }
  if(currh < 2 && d != 1){
    c.style.display = 'none';
  }
 }
}