// JavaScript Document

function XMLHttp() {
    if(window.XMLHttpRequest) {
    	try { req = new XMLHttpRequest(); }
		catch(e) { req = false; }
    }
	else if(window.ActiveXObject) {
       	try { req = new ActiveXObject("Msxml2.XMLHTTP"); }
		catch(e) {
        	try { req = new ActiveXObject("Microsoft.XMLHTTP"); }
			catch(e) { req = false; }
		}
	}
	return req;
}

function CallInProgress(xmlHttp){
	if(xmlHttp) {
		switch (xmlHttp.readyState) {
			case 1:
			case 2:
			case 3: return true;
			default: return false;
		}
	} else { return false; }
}

var xmlHTTP  = new Array();

function getHTTP(url,opt,id){
	xmlHTTP[id] = XMLHttp();
	if (xmlHTTP[id] && !CallInProgress(xmlHTTP[id])) {
		xmlHTTP[id].open('POST', url);
		xmlHTTP[id].setRequestHeader("Method", "POST "+url+" HTTP/1.1");
		xmlHTTP[id].setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
		xmlHTTP[id].send(opt);
		xmlHTTP[id].onreadystatechange = function () {
			if (xmlHTTP[id].readyState == 4) {
				if ((xmlHTTP[id].status == 200 || xmlHTTP[id].status == 0)){
					if(id!='send'){
						document.getElementById(id).innerHTML =  xmlHTTP[id].responseText;
					}
				}
			}
		};
	}
}

function Song(){
	getHTTP('ajax.php','current=1','current');
	getHTTP('ajax.php','last=1','last');
	window.setTimeout("Song()",20000);
}