/*
REQUIRES: ObjTree.js


*/

var xmlreqs = new Array();
var errorCounter = 0;

function CXMLReq(freed, responder) {
	this.freed = freed;
	this.responder = responder;
	this.xmlhttp = false;
	if (window.XMLHttpRequest) {
		this.xmlhttp = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		try
		{
		this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(ef)
		{}
	}
}

function xmlreqGET(url, responder) {
	var pos = -1;
	for (var i=0; i<xmlreqs.length; i++) {
		if (xmlreqs[i].freed == 1) { pos = i; break; }
	}
	if (pos == -1) { pos = xmlreqs.length; xmlreqs[pos] = new CXMLReq(1,responder); }
	if (xmlreqs[pos].xmlhttp) {
		xmlreqs[pos].freed = 0;
		xmlreqs[pos].responder = responder;
		xmlreqs[pos].xmlhttp.open("GET",url,true);
		xmlreqs[pos].xmlhttp.onreadystatechange = function() {
			if (typeof(xmlhttpChange) != 'undefined') { xmlhttpChange(pos); }
		}
		if (window.XMLHttpRequest) {
			xmlreqs[pos].xmlhttp.send(null);
		} else if (window.ActiveXObject) {
			xmlreqs[pos].xmlhttp.send();
		}
	}
}

function xmlreqPOST(url,data, responder) {
	var pos = -1;
	for (var i=0; i<xmlreqs.length; i++) {
		if (xmlreqs[i].freed == 1) { pos = i; break; }
	}
	if (pos == -1) { pos = xmlreqs.length; xmlreqs[pos] = new CXMLReq(1,responder); }
	if (xmlreqs[pos].xmlhttp) {
		xmlreqs[pos].freed = 0;
		xmlreqs[pos].responder = responder;
		xmlreqs[pos].xmlhttp.open("POST",url,true);
		xmlreqs[pos].xmlhttp.onreadystatechange = function() {
			if (typeof(xmlhttpChange) != 'undefined') { xmlhttpChange(pos); }
		}
		xmlreqs[pos].xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		xmlreqs[pos].xmlhttp.send(data);
	}
}

function handle_error(status, text){
 //alert("Error: "+status+"\n\n"+text);
}

 
 
function xmlhttpChange(pos) {
	if (typeof(xmlreqs[pos]) != 'undefined' && xmlreqs[pos].freed == 0 && xmlreqs[pos].xmlhttp.readyState == 4) {
		if (xmlreqs[pos].xmlhttp.status == 200 || xmlreqs[pos].xmlhttp.status == 304) {
			var xotree = new XML.ObjTree();
			var dom =  xotree.parseXML(xmlreqs[pos].xmlhttp.responseText);
			errorCounter = 0;
			xmlreqs[pos].responder(xmlreqs[pos].xmlhttp.responseText, dom);
		} else {
			if(errorCounter < 10)handle_error(xmlreqs[pos].xmlhttp.status, xmlreqs[pos].xmlhttp.responseText);
			errorCounter++;
		}
		xmlreqs[pos].freed = 1;
		xmlreqs[pos].responder = function(text, xml){};
	}
}