如何显示或隐藏导航栏treeview(frame在html中的应用)

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在页面里有三个frame,左边的是导航栏,中间是控制栏,右边是显示栏.点击中间栏就可以显示或隐藏左边的导航栏.其中中间栏里也是一个html,并准备三张图片,一张开,一张关,一张背景.

 

<html>
            <head>
                        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
                        <title>Middle</title>
                        <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
                        <SCRIPT LANGUAGE="JavaScript">
 
                                    var i=0;
                                    function changecol(){
                                                if (i==0){
                                                            closecol()
                                                } else {
                                                            opencol()
                                                }
                                    }
                                    function closecol(){
                                                top.centerFrame.cols='0,11,*'
                                                moveImg.src="image/imgopen.gif";
                                                moveImg.alt="Open Navigate Bar";
                                                i=1;
                                    }
                                    function opencol(){
                                                top.centerFrame.cols='185,11,*';
                                                moveImg.src="image/imgclose.gif";
                                                moveImg.alt="Close Navigate Bar";
                                                i=0;
                                    }
 
 
                        </SCRIPT>
            </head>
            <body background="image/bar.gif" onclick="changecol()">
                        <table width="100%" border="0" height="100%" align="center">
                                    <tr>
                                                <td>
                                                </td>
                                    </tr>
                                    <tr>
                                                <td><img name="moveImg" src="image/imgclose.gif" width="6" height="54"></td>
                                    </tr>
                                    <tr>
                                                <td>
                                                </td>
                                    </tr>
                        </table>
            </body>
</html>
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