/*-----------------------------------------------------------------------*/
/* cookies.js                                Copyright (c)2001 Duc M. Do */
/*-----------------------------------------------------------------------*/
//
// This is the cookies "library" of functions. No modification is needed
// here to use cookies. All settings are set in the calling page, or from
// another javascript function (eg. disclaimer.js)
//
// Revision History:
//
//  11/10/2001  adapt from examples on webreference.com for use on
//              thecassandraproject.org web site


//-------------------------------------------------------------------
// name      name of the cookie
// value     value of the cookie
// [expires] expiration date of the cookie
//           (defaults to end of current session)
// [path]    path for which the cookie is valid
//           (defaults to path of calling document)
// [domain]  domain for which the cookie is valid
//           (defaults to domain of calling document)
// [secure]  Boolean value indicating if the cookie transmission
//           requires a secure transmission
//-------------------------------------------------------------------
function setCookie(name, value, expires, path, domain, secure) {
    var curCookie = name + "=" + escape(value) +
                    ((expires) ? "; expires=" + expires.toGMTString() : "") +
                    ((path) ? "; path=" + path : "") +
                    ((domain) ? "; domain=" + domain : "") +
                    ((secure) ? "; secure" : "");
    document.cookie = curCookie;
}

//-------------------------------------------------------------------
// name      name of the desired cookie
// return string containing value of specified cookie or null if
// cookie does not exist
//-------------------------------------------------------------------
function getCookie(name) {
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1) {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    } else {
        begin += 2;
        var end = dc.indexOf(";", begin);
        if (end == -1) end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

//-------------------------------------------------------------------
// name      name of the cookie
// [path]    path of the cookie
//           (must be same as path used to create cookie)
// [domain]  domain of the cookie
//           (must be same as domain used to create cookie)
// path and domain default if assigned null or omitted if no
// explicit argument proceeds
//-------------------------------------------------------------------
function deleteCookie(name, path, domain) {
    if (getCookie(name)) {
        document.cookie = name + "=" + 
                          ((path) ? "; path=" + path : "") +
                          ((domain) ? "; domain=" + domain : "") +
                          "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}

//-------------------------------------------------------------------
// date      any instance of the Date object
// fix the Date object of bug in in Navigator 2.0, Macintosh
//-------------------------------------------------------------------
function fixDate(date) {
    var base = new Date(0);
    var skew = base.getTime();
    if (skew > 0)
        date.setTime(date.getTime() - skew);
}