var SideId = null;
window.onload = function() {
    initHead();
}
function initHead() {
    //新闻
    if (CheckRootPage()) {
        setHeadclass(1);
    }
    else if (CheckHeadURL("index") != -1) {
        setHeadclass(1);
    }
    else if (CheckHeadURL("currnews") != -1) {
        setHeadclass(2);
    }
    else if (CheckHeadURL("newlist") != -1) {
        setHeadclass(2);
    }
}
function setHeadclass(id) {
    for (var i = 1; i < 7; i++) {
        var eachid = "nav" + i;
        document.getElementById(eachid).className = "";
    }
    if (id != null) {
        document.getElementById("nav" + id).className = "on";
    }
}

function CheckRootPage() {
    var url = window.location.toString();
    var i = url.lastIndexOf("/");
    if (i == (url.length - 1)) { return true; }
    else { return false; }
}

//匹配字符串
function CheckHeadURL(urlname) {
    var url = window.location.toString();
    var i = url.lastIndexOf("/");
    return url.substring(i + 1, url.length).toString().toLowerCase().indexOf(urlname)
}