var ddspeed = 10;
var ddtimer = 15;
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.top = '-' + c.offsetheight + 'px';
            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);
    }
}

function ddcollapse(c){
  c.timer = setinterval(function(){ddslide(c,-1)},ddtimer);
}

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);
  }
}
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.top = parseint(c.style.top.replace('px','')) - parseint(dist * d) + 'px';
  c.style.height = currh + (dist * d) + 'px';
  if(getos()=="msie")
  {	
    c.style.opacity = currh / c.maxh;
    c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  }
  if(getos()=="firefox")
  {	
    c.style.opacity = currh / c.maxh;
    c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  }
  if(getos()=="chrome")
  {	
    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);
  }
}
function getos() 
{ 
   var osobject = ""; 
   if(navigator.useragent.indexof("msie")>0) { 
        return "msie"; 
   } 
   if(isfirefox=navigator.useragent.indexof("firefox")>0){ 
        return "firefox"; 
   } 
   if(ischrome=navigator.useragent.indexof("chrome")>0){ 
        return "chrome"; 
   } 
   if(issafari=navigator.useragent.indexof("safari")>0) { 
        return "safari"; 
   }  
   if(iscamino=navigator.useragent.indexof("camino")>0){ 
        return "camino"; 
   } 
   if(ismozilla=navigator.useragent.indexof("gecko/")>0){ 
        return "gecko"; 
   } 
}