function ahah(url, target, delay) {
  document.getElementById(target).innerHTML = 'Patientez...';
  if (window.XMLHttpRequest) {
    req = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    req = new ActiveXObject("Microsoft.XMLHTTP");
  }
  if (req != undefined) {
    req.onreadystatechange = function() {ahahDone(url, target, delay);};
    req.open("GET", url, true);
    req.send("");
  }
}  

function ahahDone(url, target, delay) {
  if (req.readyState == 4) { // only if req is "loaded"
    if (req.status == 200) { // only if "OK"
      document.getElementById(target).innerHTML = req.responseText;
    } else {
      document.getElementById(target).innerHTML="ahah error:\n"+req.statusText;
    }
    if (delay != undefined) {
       setTimeout("ahah(url,target,delay)", delay); // resubmit after delay
    }
  }
}


function ahahDoc(url, target, delay) {
	document.getElementById("subcat").innerHTML="";
	document.getElementById("titles").innerHTML="";
	document.getElementById("prev").innerHTML="";
	ahah(url, target, delay);
}

function ahahSubCat(url, target, delay) {
	document.getElementById("titles").innerHTML="";
	document.getElementById("prev").innerHTML="";
	ahah(url, target, delay);	
}

function ahahCheck(url, target, delay) {
	if(document.getElementById(target).checked){
		url = url+"&chek=1";
	}
	ahah(url, "subcat", delay);	
}