function getCookieVal (offset) {
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1)
    endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}

function _get_cookie(name) {
//  alert(name + '......' + document.cookie);
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i=0,j;
    while (i < clen) {
        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 _set_cookie(name, value) {
//  alert(document.cookie);
    var expDays = 300;
    var exp = new Date();
    exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
    var argv = _set_cookie.arguments;
    var argc = _set_cookie.arguments.length;
//    var expires = (argc > 2) ? argv[2] : null;
    var expires = exp;
    var path = (argc > 3) ? argv[3] : null;
    var domain = (argc > 4) ? argv[4] : null;
    var domain = document.location.hostname;
    var path = document.location.pathname;
    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" : "");
//  alert(expires + '||' + document.cookie);
}

function DeleteCookie (name) {
    var exp = new Date();
    exp.setTime (exp.getTime() - 1);
    var cval = _get_cookie(name);
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}