var timerlen = 5;
var slideAniLen = 500;
var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname){
  if(moving[objname])
    return;
 
  if(document.getElementById(objname).style.display != "none")
    return; // cannot slide down something that is already visible
 
  moving[objname] = true;
  dir[objname] = "down";
  startslide(objname);
}
 
function slideup(objname){
  if(moving[objname])
    return;
 
  if(document.getElementById(objname).style.display == "none")
    return; // cannot slide up something that is already hidden
 
  moving[objname] = true;
  dir[objname] = "up";
  startslide(objname);
}



function startslide(objname){
   obj[objname] = document.getElementById(objname);
   if(dir[objname] == "down"){
      obj[objname].style.height = "1px";
   }
   obj[objname].style.display = "block";
   startTime[objname] = (new Date()).getTime();
   endHeight[objname] = obj[objname].scrollHeight;
 // endHeight[objname] = "200px";
   //timerID[objname] = setInterval(Õslidetick(\Ó + objname + Ô\Õ);Õ,timerlen);
   timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
  

}



function slidetick(objname){
  var elapsed = (new Date()).getTime() - startTime[objname];
  if (elapsed > slideAniLen){
    endSlide(objname);
  } else {
    var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
    if(dir[objname] == "up")
      d = endHeight[objname] - d;
 //alert("slideDiv height: "+obj[objname].style.height+"\n d: "+d)
    obj[objname].style.height = d + "px";
  }
  return;
}



function endSlide(objname){
  clearInterval(timerID[objname]);
 
  if(dir[objname] == "up")
    obj[objname].style.display = "none";
  obj[objname].style.height = endHeight[objname] + "px";
 
  delete(moving[objname]);
  delete(timerID[objname]);
  delete(startTime[objname]);
  delete(endHeight[objname]);
  delete(obj[objname]);
  delete(dir[objname]);

  return;
}


function toggleSlide(objname){
  if(document.getElementById(objname).style.display == "none"){
    // div is hidden, so let's slide down
    dir[objname]="down";
    slidedown(objname);
  }else{
    // div is not hidden, so slide up
    slideup(objname);
  }
}