var tmp;

function GetXmlHttpObject()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}

function stateChanged() 
{ 
	if (xmlHttp.readyState==4)
	{ 
		tmp.innerHTML=xmlHttp.responseText;
		restore();
	}
}

function restore()
{
  
}

function hide(lvl)
  {
    var i=lvl;
    while ((elem = document.getElementById('lvl'+(i+1)))!=null)
      {
        elem.innerHTML="";
        i=i+1;
      }
  }

function showcat(str,lvl)
{
  var el = document.getElementById('lvl'+(lvl+1));
  tmp = el;
  el.innerHTML='<img src="http://www.bultraktor.com/images/ajax-loader.gif">';
  if(str==-1 || str=='' || document.getElementById('d'+str)==null)
  {
    hide(lvl);
  }
  else
  {
    xmlHttp=GetXmlHttpObject();
    if (xmlHttp==null)
    {
      restore();
      return;
  	}
  	var url="http://www.bultraktor.com/ajax/listsubcategory.php?list="+str;
    xmlHttp.onreadystatechange=stateChanged;
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
   // el.innerHTML="test";
    hide(lvl+1);
  }
}