function setCookie(name, value)//cookies设置   
{
    var argv = setCookie.arguments;
    var argc = setCookie.arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    if (expires != null && expires != "") {
        var LargeExpDate = new Date();
        LargeExpDate.setTime(LargeExpDate.getTime() + (expires * 1000 * 3600 * 24));
    }
    document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : (";   expires=" + LargeExpDate.toGMTString()));
}

function getCookie(name)//cookies读取   
{
    //if(document.cookie=="")alert("由于您没有开启cookie，所以无法使用该功能！请使用前先开启cookie");   
    var search = name + "="
    if (document.cookie.length > 0) {
        offset = document.cookie.indexOf(search)
        if (offset != -1) {
            offset += search.length
            end = document.cookie.indexOf(";", offset)
            if (end == -1) end = document.cookie.length
            return unescape(document.cookie.substring(offset, end))
        }
        else return ""
    }
}