var cookieExpires = 24;		// in hours

function SetCookie(name, value) {
    expires = new Date();
    expires.setTime(expires.getTime() + (cookieExpires*60*60*1000));
    document.cookie = name + '=' + escape(value) + '; expires=' + expires.toGMTString() +  '; path=/';
}


function GetCookie(name) {
    var cookie = ' ' + document.cookie;
    var search = ' ' + name + '=';
    var setStr = null;
    var offset = 0;
    var end = 0;
    if ( cookie.length > 0 ) {
        offset = cookie.indexOf(search);
        if ( offset != -1 ) {
            offset += search.length;
            end = cookie.indexOf(';', offset)
            if (end == -1) {
                end = cookie.length;
            }
            setStr = unescape(cookie.substring(offset, end));
        }
    }
    return(setStr);
}


function slideShow(idx) { 
    if ( idx >= pic.length ) {
        idx = 0;
    }
    SetCookie('slideIndex', idx);
    document.getElementById("slide").src = pic[idx].src;
    idx++;
    setTimeout("slideShow(" + idx + ")", 3000); 
}