Hide shoutbox sliding atas bawah

Cara nak sembunyikan shoutbox dan bila tekan je akan keluar dgn cara sliding atas bawah
stepnya

Log in blogger =>design =>layout=>add gadget =>html/javascript

<style type="text/css">
    #gb{
    position:fixed;
    right:450px;
    z-index:+1000;
    }
    * html #gb{position:relative;}


    .gbtab{
    height:100px;
    width:30px;
    float:left;
    cursor:pointer;
    background:url();
    }
    .gbcontent{
    float:left;
    border:2px solid  #99CCFF;
    background:#ffffff;
    -moz-border-radius-topleft:15px;
    -moz-border-radius-topright:15px;
    -moz-border-radius-bottomleft:15px;
    -moz-border-radius-bottomright:15px;
    padding:10px;
    }
    </style>
    <script type="text/javascript">
    function showHideGB(){
    var gb = document.getElementById("gb");
    var w = gb.offsetWidth;
    gb.opened ? moveGB(0, 1500-w) : moveGB(20-w, 0);
    gb.opened = !gb.opened;
    }
    function moveGB(x0, xf){
    var gb = document.getElementById("gb");
    var dx = Math.abs(x0-xf) > 25 ? 35 : 1;
    var dir = xf>x0 ? 1 : -1;
    var x = x0 + dx * dir;
    gb.style.top = x.toString() + "px";
    if(x0!=xf){setTimeout("moveGB("+x+", "+xf+")", 10);}
    }
    </script>
    <div id="gb">


    <div class="gbtab" onclick="showHideGB()"> </div>
    <div class="gbcontent">

KOD SHOUTBOX SENDIRI

    <center><a href="javascript:void(0);" onclick="showHideGB()"><input type="button" value="Close" class="close" /></a>


    </center></div>
    </div>
    <script type="text/javascript">
    var gb = document.getElementById("gb");
    gb.style.top = (-400-gb.offsetWidth).toString() + "px";
    </script>


    <a class="west" href="javascript:void(0);" onclick="showHideGB()" title="Buku Tamu"><img alt="Buku Tamu"heigth="125"src="http://i1108.photobucket.com/albums/h416/hana611/shoutboxcopy.png" border="0" /></a></center>

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