jquery图片新闻多组图片轮播

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jQuery点击缩略图切换大图，缩略图若是很多的话，支持分页，左右按钮滚动，点击大图左右按钮，到一定数量，缩略图会跟着滚动。

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//mouseover效果
function liMouseOn() {
    $(".scrolltab .ulBigPic li").attr("class", "");
    for (var i = 0; i < $(".scrolltab .ulBigPic li").length; i++) {
        (function(j) {
            $(".scrolltab .ulBigPic li:eq(" + j + ")").mouseover(function() {
                if ($(".scrolltab").attr("class") == "dSmallList" || $(".scrolltab").attr("class") == "dMiddleList") {
                    if ($(this).attr("class") != "liSelected") {
                        $(this).attr("class", "liSelected");
                    }
                }
            });
            $(".scrolltab .ulBigPic li:eq(" + j + ")").mouseout(function() {
                if ($(".scrolltab").attr("class") == "dSmallList" || $(".scrolltab").attr("class") == "dMiddleList") {
                    if ($(this).attr("class") == "liSelected") {
                        $(this).attr("class", "");
                    }
                }
            });
        })(i);
    }
}

//定义当前、之前、之后要显示图片的排位
var curPic = 0, nextPic = -1, prePic = -1;
preShowPic = -1;
var allPic = $(".scrolltab .ulBigPic li").length;
//初始化当前、之前、之后要显示图片的排位

function numInit(num) {
    if (num == "init") {
        if (allPic > 1) {
            nextPic = curPic + 1;
            prePic = allPic - 1;
        } else if (allPic == 1) {
            nextPic = 0;
            prePic = 0;
        }
        $(".scrolltab .ulBigPic li:eq(" + curPic + ")").attr("class", "liSelected");
    } else if (num == "plus") {
        preShowPic = curPic;
        prePic = curPic;
        curPic = nextPic;
        if (curPic < (allPic - 1)) {
            nextPic = curPic + 1;
        } else if (curPic == (allPic - 1)) {
            nextPic = 0;
        }
        $(".scrolltab .ulBigPic li:eq(" + curPic + ")").attr("class", "liSelected");
        if (preShowPic != curPic) {
            $(".scrolltab .ulBigPic li:eq(" + preShowPic + ")").attr("class", "");
        }
    } else if (num == "minus") {
        preShowPic = curPic;
        nextPic = curPic;
        curPic = prePic;
        if (curPic > 0) {
            prePic = curPic - 1;
        } else if (curPic == 0 && allPic > 1) {
            prePic = allPic - 1;
        }
        $(".scrolltab .ulBigPic li:eq(" + curPic + ")").attr("class", "liSelected");
        if (preShowPic != curPic) {
            $(".scrolltab .ulBigPic li:eq(" + preShowPic + ")").attr("class", "");
        }
    } else {
        preShowPic = curPic;
        curPic = num;
        if (curPic == (allPic - 1)) {
            nextPic = 0;
            if (allPic > 1) {
                prePic = curPic - 1;
            } else if (allPic == 1) {
                prePic = 0;
            }
        } else if (curPic == 0) {
            prePic = allPic - 1;
            if (allPic > 1) {
                nextPic = 1;
            } else if (allPic == 1) {
                nextPic = 0;
            }
        } else {
            nextPic = curPic + 1;
            prePic = curPic - 1;
        }
        $(".scrolltab .ulBigPic li:eq(" + curPic + ")").attr("class", "liSelected");
        if (preShowPic != curPic) {
            $(".scrolltab .ulBigPic li:eq(" + preShowPic + ")").attr("class", "");
        }
    }
    //alert("curPic="+curPic+"/nextPic="+nextPic+"/prePic="+prePic+"/preShowPic="+preShowPic);
}

//大图左右按钮初始化
function btnAInit() {
    if (allPic < 2) {
        $("#sLeftBtnA").attr("class", "sLeftBtnABan");
        $("#sRightBtnA").attr("class", "sRightBtnABan");
    } else {
        if (curPic == 0) {
            $("#sLeftBtnA").attr("class", "sLeftBtnABan");
            $("#sRightBtnA").attr("class", "sRightBtnA");
        } else if (curPic == (allPic - 1)) {
            $("#sLeftBtnA").attr("class", "sLeftBtnA");
            $("#sRightBtnA").attr("class", "sRightBtnABan");
        } else {
            $("#sLeftBtnA").attr("class", "sLeftBtnA");
            $("#sRightBtnA").attr("class", "sRightBtnA");
        }
    }
}

//小图左右按钮初始化
function btnBInitA() {
    if (allPic > 6) {
        $("#sRightBtnB").attr("class", "sRightBtnB");
    }
}