createCookie("cookies_on",1,1);
if (readCookie("cookies_on") == 1)
	{
if (readCookie("not_blocked") == 1)
	{
	}
else
	{
	document.location="http://www.sixsigmaspc.com/noentry/a-d-block.html";
	}
	}
<!--Test for a value -->
if (not_blocked != 1)
	{
	document.location="http://www.sixsigmaspc.com/noentry/a-d-block.html";
	}

function createCookie(name,value,hours)
{
	if (hours)
	{
		var date = new Date();
		date.setTime(date.getTime()+(hours*30*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;
}