var req;
var reqid;

function startreq(){
	v = false;
    // branch for native XMLHttpRequest object
    if(window.XMLHttpRequest) {
    	try {
			v = new XMLHttpRequest();
        } catch(e) {
			v = false;
        }
    // branch for IE/Windows ActiveX version
    } else if(window.ActiveXObject) {
       	try {
        	v = new ActiveXObject("Msxml2.XMLHTTP");
      	} catch(e) {
        	try {
          		v = new ActiveXObject("Microsoft.XMLHTTP");
        	} catch(e) {
          		v = false;
        	}
		}
    }
    return(v);
}

function loadXMLDoc(url, id) {
	req = startreq();
	reqid = id;
	if(req) {
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send("");
	}
}

function getdata(id, type, params) {
	loadXMLDoc("response_handler.php?type=" + escape(type) + "&param=" + escape(params), id);
}

function processReqChange() {
	if (req.readyState == 4) {
		if (req.status == 200) {
			var response = req.responseText;
			document.getElementById(reqid).innerHTML = response;
		} else
			alert("status is " + req.status);
	}
}