导航条效果的代码

<div class="all">
    <div class="m1">标题1</div>
    <div class="m2">标题2</div>
    <div class="m3">标题3</div>
    <div class="m4">标题4</div>
    <div class="m5">标题5</div>
    <div class="m6">标题6</div>
    </div>

    <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
    <script type="text/javascript">
    $(document).ready(function () {
    myHide();
    });
    function myHide() {
        //alert("hello");
        //注册事件
        $(".m1").bind('mouseover', m1_mouseover);
        $(".m1").bind('mouseout', m1_mouseout);
        $(".m2").bind('mouseover', m2_mouseover);
        $(".m2").bind('mouseout', m2_mouseout);
        $(".m3").bind('mouseover', m3_mouseover);
        $(".m3").bind('mouseout', m3_mouseout);
        $(".m4").bind('mouseover', m4_mouseover);
        $(".m4").bind('mouseout', m4_mouseout);
        $(".m5").bind('mouseover', m5_mouseover);
        $(".m5").bind('mouseout', m5_mouseout);
        $(".m6").bind('mouseover', m6_mouseover);
        $(".m6").bind('mouseout', m6_mouseout);
    };
    function m1_mouseover() {
        $(".m1").animate({  "100px", height: "30px",fontSize:"22px" }, "fast");
    }
    function m1_mouseout() {
        $(".m1").animate({  "70px", height: "20px", fontSize: "14px" }, "fast");
    }
    function m2_mouseover() {
        $(".m2").animate({  "100px", height: "30px", fontSize: "22px" }, "fast");
    }
    function m2_mouseout() {
        $(".m2").animate({  "70px", height: "20px", fontSize: "14px" }, "fast");
    }
    function m3_mouseover() {
        $(".m3").animate({  "100px", height: "30px", fontSize: "22px" }, "fast");
    }
    function m3_mouseout() {
        $(".m3").animate({  "70px", height: "20px", fontSize: "14px" }, "fast");
    }
    function m4_mouseover() {
        $(".m4").animate({  "100px", height: "30px", fontSize: "22px" }, "fast");
    }
    function m4_mouseout() {
        $(".m4").animate({  "70px", height: "20px", fontSize: "14px" }, "fast");
    }
    function m5_mouseover() {
        $(".m5").animate({  "100px", height: "30px", fontSize: "22px" }, "fast");
    }
    function m5_mouseout() {
        $(".m5").animate({  "70px", height: "20px", fontSize: "14px" }, "fast");
    }
    function m6_mouseover() {
        $(".m6").animate({  "100px", height: "30px", fontSize: "22px" }, "fast");
    }
    function m6_mouseout() {
        $(".m6").animate({  "70px", height: "20px", fontSize: "14px" }, "fast");
    }
    </script>
    <style type="text/css">
    .m1,.m2,.m3,.m4,.m5,.m6
    {
        70px;
        height:20px;
        background-color:#CCCCCC;
        border: thin solid #9999FF;
        font-size:14px;
      }
      .all
      {
        80px;
        height:160px;
        text-align:center;
      }
    </style>