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://www.thietkewebpro.vn"]
		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;
	}
}