var DDSPEED = 10;
var DDTIMER = 15;
var OFFSET = -50;
var ZINT = 100;

function ddMenu(id,d){
  var h = document.getElementById('ddheader-' + id);
  var c = document.getElementById('ddcontent-' + id);
  var hs = document.getElementById('hideselects-' + id);
  
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    c.style.display = 'block';
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.left = (h.offsetWidth + OFFSET) + 'px';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    ZINT = ZINT + 1;
    c.style.zIndex = ZINT;
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
  
  //IE 6 Hack
  makeWindowed(hs);
}

function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

function cancelHide(id){
  var h = document.getElementById('ddheader-' + id);
  var c = document.getElementById('ddcontent-' + id);
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

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 > (c.maxh - 2) && d == 1){
    clearInterval(c.timer);
  }else if(dist < 1 && d != 1){
    clearInterval(c.timer);
    c.style.display = 'none';
  }
}

// make the specified div a windowed control in IE6
// this masks an iframe (which is a windowed control) onto the div,
// turning the div into a windowed control itself
function makeWindowed(p_div)
{
  var is_ie6 = document.all && (navigator.userAgent.toLowerCase().indexOf("msie 6.") != -1);
        
  if (is_ie6)
  {
    var html = "<iframe style=\"position: absolute; display: block; z-index: -1; width: 100%; height: 100%; top: 0; left: 0; filter: mask(); background-color: #ffffff; \"></iframe>";
    
    //alert(p_div.innerHTML);
    
    if (p_div) 
    { 
      if (p_div.innerHTML.length > 0) 
      {
        p_div.innerHTML.replace(html,'');
        p_div.innerHTML += html; 
      }
    }
    
    // force refresh of div
    var olddisplay = p_div.style.display;
    p_div.style.display = 'none';
    p_div.style.display = olddisplay;
  };
}