function showDiv(obj) 
{      
  var url = "/pss/mysite/code/action.php?action=panel&visible=";
  
  if (document.getElementById(obj).style.display == "none")
  {
    /*$('div#top_down').slideDown(700);
    $('div#top_down').hide();*/
           
    new Effect.SlideDown(obj, {duration:0.5});
    url += 'y';          
  }
  else
  {
    /*$('div#top_down').show();
    $('div#top_down').slideUp(700);*/
    new Effect.SlideUp(obj, {duration:0.5});
    
    url += 'n';      
  }   
  
  
  if(window.XMLHttpRequest) {
    req = new XMLHttpRequest();
  } else if(window.ActiveXObject) {
    req = new ActiveXObject("Microsoft.XMLHTTP");
  }
  req.open("GET", url, true);
  req.send(null);  
}