var http = createRequestObject();
var lastUrl = '';
var current_url = '';
var field = '';
var interval = '';


function createRequestObject() {
	var xmlhttp;
	try { xmlhttp=new ActiveXObject("Msxml2.XMLHTTP"); }
	catch(e) {
    try { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}
	catch(f) { xmlhttp=null; }
  }
  if(!xmlhttp&&typeof XMLHttpRequest!="undefined") {
	xmlhttp=new XMLHttpRequest();
  }
	return  xmlhttp;
}

function sendRequest(current_url,act) {
	try{
		field = document.getElementById("data_field");
		document.getElementById("loading").innerHTML = loadingText;
		document.getElementById("loading").style.display = "block";

		current_url = encodeURIComponent(current_url);
		http.open('POST',  'index.php');
		http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		http.onreadystatechange = handleResponse;
		http.send('url='+current_url);
	}
	catch(e){}
	finally{}
}

function handleResponse() {
	try {
		if((http.readyState == 4)&&(http.status == 200)){
			document.getElementById("loading").style.display = "none";
			response = http.responseText;
			if (current_url.indexOf('Play') != -1 || current_url.indexOf('Gift') != -1) {
				field.style.marginBottom = "10";
				/*document.getElementById("show_hide").style.display = "block";*/
			}
			field.innerHTML = response;
			field.style.display = "";
		}
  	}
	catch(e){}
	finally{}
}

function getVar(url,cnt)
{
	url=url+'#';
	url=url.split('#');
	if (!url[1]) window.location.href = '#Home';
	url=url[1];
	url=url+',';
	url=url.split(',');
	if (url[0] == 'Logout')
		window.location.href = '?refresh=1';
	if (cnt != -1) {
		url=url[cnt];
		if (!url) return '';
	}
	return url;
}

function loadPage() {
	act = getVar(window.location.href,0);
	if (act) {
		current_url=window.location.href;
		current_url=current_url+'#';
		current_url=current_url.split('#');
		current_url=current_url[1];
		if (current_url) sendRequest(current_url,act);
	}
}

function urlCheck()
{
	url=window.location.href;
	if (url.indexOf('?') != -1 ) {
		url_temp = url.split('?');
		clearInterval(interval);
		href = url_temp[0];
		
		url=url+'#';
		url=url.split('#');
		if (url[1]) window.location.href = href+'#'+url[1];
		return;
	}
	if (url != '' && url!=lastUrl)
	{
		loadPage();
		lastUrl=url;
	}
}

function startLoad() {
	interval = setInterval('urlCheck()',100);
}



function do_search() {
	kw = document.getElementById("keyword").value;
	if (!kw) alert('Bạn chưa nhập từ khóa');
	else {
		kw = encodeURIComponent(kw);
		s_type = document.getElementById("searchType");
		type = s_type.options[s_type.selectedIndex].value;
		switch (type) {
			case 'song' : type = 1; break;
			case 'singer' : type = 2; break;
			case 'album' : type = 3; break;
		}
		last_url = '';
		window.location.href = '#Search,'+type+','+kw;
	}
	return false;

}



function trim(a) {
	return a.replace(/^s*(S*(s+S+)*)s*$/, "$1");
}


function popup(url,wdname,width,height)
{
	if (width == null)  { width  = 200; }   // default width
	if (height == null) { height = 400; }   // default height
	newwin=window.open(url,wdname,'fullscreen=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width='+width+',height='+height);
	if (document.all)
	{
		newwin.moveTo(0,0);
		newwin.focus();
	}
}