//定义背景色数组
var bgArray = new Array(4);
bgArray[0]="EBF5FC";
bgArray[1]="F899BF";
bgArray[2]="E3EB78";
bgArray[3]="E8E8E8";
bgArray[4]="E8E8E8";

var bgChoose = "#"+bgArray[0];//with default value
function setActiveStyleSheet(title) {
    var i, a, main;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
            a.disabled = true;
            if(a.getAttribute("title") == title) a.disabled = false;
        }
    }
    //设置页面背景色，解决IE中背景色不刷新的BUG
    var bgNo
    bgNo = title.substring(title.length-1,(title.length));
    //alert(bgNo);
    bgChoose="#"+bgArray[bgNo-1];
}

function getActiveStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) 
            return a.getAttribute("title");
    }
    return null;
}

function getPreferredStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("rel").indexOf("alt") == -1
        && a.getAttribute("title")
        ) 
        return a.getAttribute("title");
    }
    return null;
}

function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else 
        expires = "";
    
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

//window.onload = function(e) {
//    document.body.bgColor = bgChoose;
////    var cookie = readCookie("style");
////    var title = cookie ? cookie : getPreferredStyleSheet();
////    setActiveStyleSheet(title);
//}

//window.onunload = function(e) {
//    var title = getActiveStyleSheet();
//    createCookie("style", title, 365);
//}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);