Javascript cookie for whole domain

Hi Experts

I have two websites.  When a person visits the home page of the website1 they get the choice of staying on 1 or switching to website2.  I have a javascript redirect that drops a cookie and works OK.  If they return to the home page of website1 it remembers their choice and  auto-redirects them to website2.

How do I change my code so that it works across the whole domain rather than just the home page?  Eg if the first time they visit any page on website1 they are given the choice then the cookie remembers and if they return to website1 it will redirect them to their previous choice.

My code that works on a single page is below.  How can I edit it to work on a whole site?

Many thanks,

Will

var expDays = 30;
var exp = new Date();
exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

function getCookieVal (offset) {
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie (name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return getCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
function SetCookie (name, value) {
var argv = SetCookie.arguments;
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + escape (value) +
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
((path == null) ? "" : ("; path=" + path)) +
((domain == null) ? "" : ("; domain=" + domain)) +
((secure == true) ? "; secure" : "");
}
function DeleteCookie (name) {
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = GetCookie (name);
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

var favorite = GetCookie('dfa-country');

if (favorite != null) {
switch (favorite) {
case 'usa' : 	url = 'http://www.d-fa.com/usa-store/'; // change these!
	     	break;
case 'nz' : 	url = 'http://www.d-fa.com/store/';
	     	break;
case 'rest' : url = 'http://www.d-fa.com/store/';
		break;
}
window.location.href = url;

}

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