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);
  }
}

// Hide all select boxes
function hideSelect() {
  if (document.all) {
    for (formIdx=0; formIdx<document.forms.length; formIdx++) {
      var theForm = document.forms[formIdx];
      for (elementIdx=0; elementIdx<theForm.elements.length; elementIdx++) {
        window.status += theForm[elementIdx].type;
        if(theForm[elementIdx].type == "select-one") {
          theForm[elementIdx].style.visibility = "hidden";
        }
      }
    }
  }
}

// Unhide all select boxes
function unhideSelect() {
  if (document.all) {
    for (formIdx=0; formIdx<document.forms.length; formIdx++) {
      var theForm = document.forms[formIdx];
        for(elementIdx=0; elementIdx<theForm.elements.length; elementIdx++) {
          if(theForm[elementIdx].type == "select-one") {
            theForm[elementIdx].style.visibility = "visible";
          }
         }
      }
  }
}