function loading(cid)
{
document.getElementById(cid).innerHTML = '<center><img src="images/load.gif" border=0><br>&nbsp;<font face="Vernada" size="2pt" color="#ffffff">Đang tải dữ liệu. Xin vui lòng chờ...<br>Nếu đợi quá 1 phút xin vui lòng nhấn phím <b>F5</b> do Server đang quá tải</a></font>';
}
function noCache(uri){return uri.concat(/\?/.test(uri)?"&":"?","noCache=",(new Date).getTime(),".",Math.random()*1234567)};
function htv_load(url, containerid)
{
var page_request = false

if (window.XMLHttpRequest) // if Mozilla, Safari etc
page_request = new XMLHttpRequest()
else if (window.ActiveXObject)
{ // if IE

try 
{
page_request = new ActiveXObject("Msxml2.XMLHTTP")
} 

catch (e)
{
try 
	{ page_request = new ActiveXObject("Microsoft.XMLHTTP") }
catch (e) {}
}

}
else
return false

page_request.onreadystatechange=function(){
//alert(page_request.readyState);
if(page_request.readyState != 4 )
{
loading(containerid);
}
else 
{
document.getElementById(containerid).innerHTML=page_request.responseText
}
}

page_request.open("GET",noCache(url), true)
page_request.send(page_request)
}
function check_handle(result) {
		if(result[0] == 'yes') {
			document.getElementById('not_available').style.display = 'none';
			document.getElementById('available').style.display = 'block';
		}
		else {
			document.getElementById('available').style.display = 'none';
			document.getElementById('not_available').style.display = 'block';
			var str = 'Sorry that username is not available try these <br />';
			for(i = 1; i < result[1]; i++) {
				str += "<input type=\"radio\" name=\"try\" onclick=\"switch_username('"+result[i+1]+"')\"/>" + result[i+1] + "<br />";
			}
			document.getElementById('not_available').innerHTML = str;
		}
	}

	function check_user_exist() {
		var username = document.getElementById('username').value;
		x_check_user_exist(username, check_handle);
	}

	function switch_username(username) {
		document.getElementById('username').value = username;
	}