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function clear() {    var exdate = new Date();    exdate.setTime(exdate.getTime() - 10000);    document.cookie = "p=0;expires=" + exdate.toGMTString() + ";path=/";}function set(p) {    var exdate = new Date();    exdate.setTime(exdate.getTime() + (60 * 60 * 1000));    document.cookie = "p=" + escape(p) + ";expires=" + exdate.toGMTString() + ";path=/";}function get() {    var p = "";    var c_name = "p";    if (document.cookie.length > 0) {        var c_start = document.cookie.indexOf(c_name + "=");        if (c_start != -1) {            c_start = c_start + c_name.length + 1;            var c_end = document.cookie.indexOf(";", c_start);            if (c_end == -1) c_end = document.cookie.length;            P = unescape(document.cookie.substring(c_start, c_end))        }    }    if (p == "" || p == null) {        p = prompt("请输入：");    }    return p;}

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