function ajax(url,target) {
   // native XMLHttpRequest object
   //document.getElementById(target).innerHTML = 'sending...';
   if (window.XMLHttpRequest) {
       req = new XMLHttpRequest();
       req.onreadystatechange = function() {ahahDone(target);};
       req.open("GET", url, true);
       req.send(null);
   // IE/Windows ActiveX version
   } else if (window.ActiveXObject) {
       req = new ActiveXObject("Microsoft.XMLHTTP");
       if (req) {
           req.onreadystatechange = function() {ahahDone(target);};
           req.open("GET", url, true);
           req.send();
       }
   }
}

function ajax_once(url,target) {
	try{
	   if (req.readyState == 4) {
		   ajax(url,target);
	   }
	}catch(e){
		ajax(url,target);
	}
}

function ajax_none(target) {
 document.getElementById(target).innerHTML = '';
}

function ahahDone(target) {
   // only if req is "loaded"
   if (req.readyState == 4) {
       // only if "OK"
       if (req.status == 200 || req.status == 304) {
           results = req.responseText;
           document.getElementById(target).innerHTML = results;
       } else {
           /*document.getElementById(target).innerHTML="ahah error:\n" +
               req.statusText;*/
       }
   }
}