function setTimezoneCookies()
{
	var now = new Date();
	var expire = new Date();

	// One year expiration, this way we don't need to wait at least one page
	// load to have accurate timezone info each session, but only each time the user
	// comes with cleared cookies
	expire.setTime( now.getTime() + 3600000*24*365 );
	tzOffset = now.getTimezoneOffset() * -1 * 60;
	isDST = 0;
	document.cookie = "timezoneOffset=" + tzOffset + "," + isDST + ";expires="+expire.toGMTString() + ";path=/";
}


// We always want to have the timezone cookie set for PHP to use
setTimezoneCookies();