Check for cookie support, then check for secret variable in URL to permit access to site, otherwise redirect

cookieRedirect.js

// from http://www.quirksmode.org/js/cookies.html
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=/";
}

// from http://www.quirksmode.org/js/cookies.html
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;
}

// http://sveinbjorn.org/cookiecheck
function are_cookies_enabled()
{
	var cookieEnabled = (navigator.cookieEnabled) ? true : false;

	if (typeof navigator.cookieEnabled == "undefined" && !cookieEnabled)
	{
		document.cookie="testcookie";
		cookieEnabled = (document.cookie.indexOf("testcookie") != -1) ? true : false;
	}
	return (cookieEnabled);
}

function getUrlVars()
{
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for(var i = 0; i < hashes.length; i++)
    {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = hash[1];
    }
    return vars;
}

if(are_cookies_enabled()) {

	if(getUrlVars() == 'permitted') {
		createCookie('permitted','1',365);
	}

	if(!readCookie('permitted')) {
		window.location = "http://betweenbrain.com/"
	}
}