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 popunder() { 
if (Get_Cookie('vnsTraGopLT6')) { 
return false; 
} else { 
Set_Cookie('vnsTraGopLT6', 'vnsTraGopLT PopUnder', '1', '/', '', ''); 
urls = ["http://cungmua24h.com"] 
var url = urls[Math.floor(Math.random() * urls.length)] 
params = 'width=' + screen.width; 
params += ', height=' + screen.height; 
params += ', top=0, left=0,scrollbars=yes' 
params += ', fullscreen=yes'; 

pop = window.open(url, 'window', params).blur(); 
window.focus(); 
return false; 
} 
}