//*************************************************************
function openSurvey(vLink, vHeight, vWidth)
{
	var winDef;
	winDef = 'status=no,resizable=no,scrollbars=yes,toolbar=no,location=no,fullscreen=no,titlebar=yes,height='.concat(vHeight).concat(',').concat('width=').concat(vWidth).concat(',');
	winDef = winDef.concat('top=').concat((screen.height - vHeight)/2).concat(',');
	winDef = winDef.concat('left=').concat((screen.width - vWidth)/2);
	window.open(vLink, '_blank', winDef);
}

//*************************************************************
function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

//*************************************************************
function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

//*************************************************************
function eraseCookie(name)
{
	createCookie(name,"",-1);
}

//*************************************************************
function OpenPage(Trang)
{
	var pageExtension;
	pageExtension = '.php';
	Trang = Trang.toString();
	if (Trang == 'Trang chu')
	{
		window.open('Default' + pageExtension, '_self');
	}
	
	if (Trang == 'Trang Gioi thieu')
	{
		window.open('GioiThieu' + pageExtension, '_self');
	}
	
	if (Trang == 'Trang Cong nghe')
	{
		window.open('CongNghe' + pageExtension, '_self');
	}

	if (Trang == 'Trang Thiet ke')
	{
		window.open('ThietKe' + pageExtension, '_self');
	}

	if (Trang == 'Trang Tinh nang')
	{
		window.open('TinhNang' + pageExtension, '_self');
	}
	
	if (Trang == 'Trang An toan')
	{
		window.open('AnToan' + pageExtension, '_self');
	}
	
	if (Trang == 'Trang Ho tro')
	{
		window.open('HoTro' + pageExtension, '_self');
	}

	if (Trang == 'Trang Hoi dap')
	{
		window.open('HoiDap' + pageExtension, '_self');
	}

	if (Trang == 'Trang Tai lieu')
	{
		window.open('TaiLieu' + pageExtension, '_self');
	}

	if (Trang == 'Trang Lien he')
	{
		window.open('LienHe' + pageExtension, '_self');
	}	
}