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 '';
}

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

function chk_favorite(field, memberID) {
    d=eval(field);
    if (d.checked==true) {
        add_to_cookie(memberID);
    } else {
        remove_from_cookie(memberID);
    }
}

function chk_favorite_selected(field, memberID) {
	d=eval(field);
    var cookieValue = readCookie('favourites');
    if (cookieValue == 'null') return;
    var ids = cookieValue.split(',');
    for (i=0; i < ids.length; i++) {
        var mid = ids[i];
        if (mid == memberID) {
            d.checked = true;
        }
    }
}

function add_to_cookie(memberID) {
    var cookieValue = readCookie('favourites');
    if (cookieValue == 'null' || cookieValue == '') cookieValue = memberID;
    else cookieValue = cookieValue+','+memberID;
    createCookie('favourites', cookieValue, 120);
}

function remove_from_cookie(memberID) {
    var cookieValue = readCookie('favourites');
    if (cookieValue == 'null') {
        return;
    }
    var ids = cookieValue.split(',');
    var newCookieValue = '';
    for (i=0; i < ids.length; i++) {
        var mid = ids[i];
        if (mid != memberID && mid != 'null' && mid != '') {
            if (newCookieValue == '') newCookieValue = mid;
            else newCookieValue = newCookieValue+','+mid;
        }
    }
    createCookie('favourites', newCookieValue, 120);

}