// JavaScript Document

function createREQ(){
	try {
		req = new XMLHttpRequest(); // e.g. Firefox
	} catch(err1){
		try {
			req = new ActiveXObject("Msxml2.XMLHTTP"); // some versions IE
		} catch (err2){
			try {
				req = new ActiveXObject("Microsoft.XMLHTTP"); // some versions IE
			} catch (err3){
				req = false;
			}
		}
	}
	//alert("return req");
	return req;
}

function requestGET(url, query, req){
	myRand = parseInt(Math.random()*99999999);
	req.open("GET", url+'?'+query+'&rand='+myRand,true);
	req.send(null);
	//alert("requestGET");
}

function requestPOST(url, query, req){
	req.open("POST", url, true);
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	req.send(query);
}

function doCallback(callback, item){
	//alert("do callback");
	eval(callback + '(item)');	
}

function doAjax(url, query, callback, reqtype, getxml){
	//alert("doAjax");
	// create the XMLHTTPRequest request object instance
	var myreq = createREQ();
	
	myreq.onreadystatechange = function(){
			//alert("onreadystatechange:"+myreq.readystate);
		if (myreq.readyState == 4){
			if (myreq.status == 200){
				var item = myreq.responseText;
				if (getxml == 1){
					item = myreq.responseXML;	
				}
				doCallback(callback, item);
			}
		}
		
	};
	//alert("state change set");
	if (reqtype == 'post'){
		requestPOST(url, query, myreq);	
	} else {
		requestGET(url, query, myreq);
	}
}