// 网站风格切换 保存cookie 
function getCookie(Name) {
    var re = new RegExp(Name + "=[^;]+", "i"); //construct RE to search for target name/value pair
    if (document.cookie.match(re)) //if cookie found
        return document.cookie.match(re)[0].split("=")[1] //return its value
    return null
}
function setCookie(name, value, days) {
    var expireDate = new Date()
    //set "expstring" to either future or past date, to set or delete cookie, respectively
    var expstring = (typeof days != "undefined") ? expireDate.setDate(expireDate.getDate() + parseInt(days)) : expireDate.setDate(expireDate.getDate() - 5)
    document.cookie = name + "=" + value + "; expires=" + expireDate.toGMTString() + "; path=/";
}
function deleteCookie(name) {
    setCookie(name, "moot")
}
function setStylesheet(title) {
    var i, cacheobj
    for (i = 0; (cacheobj = document.getElementsByTagName("link")[i]); i++) {
        if (cacheobj.getAttribute("rel").indexOf("style") != -1 && cacheobj.getAttribute("title")) {
            cacheobj.disabled = true
            if (cacheobj.getAttribute("title") == title)
                cacheobj.disabled = false //enable chosen style sheet
        }
    }
}
function chooseStyle(styletitle, days) {
    if (document.getElementById) {
        setStylesheet(styletitle)
        setCookie("mysheet", styletitle, days)
    }
}
var selectedtitle = getCookie("mysheet")
if (document.getElementById && selectedtitle != null) //load user chosen style sheet if there is one stored
    setStylesheet(selectedtitle)