function qh() {
    var M = null; //标题
    var T = null; //内容

    this.main = function (z, g) {//内容ID,标题ID 主
        nex(z, g);
        var zz = document.getElementById(g);
        huan(zz);
    } //一 使用MAIN, 二 对IMG添加onmouseover事件=hg,三 内容添加 隐藏

    function huan(z) {
        var src = z.src;
        z.src = z.getAttribute("src1");
        z.setAttribute("src1", src);
    }

    this.hg = function (g, z) {//内容ID,this
        huan(M);
        huan(z);
        M = z;
        T.style.display = "none";
        var bg = document.getElementById(g);
        bg.style.display = "";
        T = bg;
    }//划

    this.mainBG = function (g, z, ys) {//标题ID,内容ID,标题划过样式
        nex(z, g);
        M.className = ys;
        T.style.display = "";
    }//主

    this.hgBG = function (g, z, ys) {//内容ID,this,标题划过样式
        M.className = "";
        z.className = ys;
        M = z;
        T.style.display = "none";
        T = document.getElementById(g);
        T.style.display = "";
    }//划
    
    function nex(z, g) {
        var zz = document.getElementById(g);
        var bg = document.getElementById(z);
        bg.style.display = "";
        M = zz;
        T = bg;
    } //内容,标题
}