function Set_Cookie(name, value, expires, path, domain, secure) {
var today = new Date();
today.setTime(today.getTime());

if (expires) {
expires = expires * 1000 * 60 * 60 * 12;
}
var expires_date = new Date(today.getTime() + (expires));

document.cookie = name + "=" + escape(value) +
((expires) ? ";expires=" + expires_date.toGMTString() : "") +
((path) ? ";path=" + path : "") +
((domain) ? ";domain=" + domain : "") +
((secure) ? ";secure" : "");
}

function Get_Cookie(name) {

var start = document.cookie.indexOf(name + "=");
var len = start + name.length + 1;
if ((!start) &&
(name != document.cookie.substring(0, name.length))) {
return null;
}
if (start == -1) return null;
var end = document.cookie.indexOf(";", len);
if (end == -1) end = document.cookie.length;
return unescape(document.cookie.substring(len, end));
}

function Delete_Cookie(name, path, domain) {
if (Get_Cookie(name)) document.cookie = name + "=" +
((path) ? ";path=" + path : "") +
((domain) ? ";domain=" + domain : "") +
";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}
function _pop_it(url){
//params = 'width=' + screen.width;
//params += ', height=' + screen.height;
params = 'width=500' ;
params += ', height=400';
params += ', top=0, left=0,scrollbars=yes,titlebar=yes,location=yes,toolbar=yes'
params += ', fullscreen=yes';

pop = window.open(url, 'window'+url, params).blur();
window.focus();
return false;
}
function popunder() {
//urls = ["http://kq.com.vn","http://kq.com.vn","http://kq.com.vn","http://kq.com.vn"]
//urls = ["http://www.thuvienungdung.com/"]
current=Get_Cookie('popup_site');
if(current ==null) 
current =0;
if (current>=urls.length) {
return false;
} else {
_pop_it(urls[current]);
current++;
Set_Cookie('popup_site', current, '1', '/', '', '');
return false;
}
}