topCat 과 subCat 이 무엇을 의미하는지 지정해주지 않으셨네요...
이들에 대한 값을 정해주셔야 합니다...


><script language="javascript">
>var menuImgSvr = "image/";
>var catMenu = [
>        [0,  "n_menu_01_on.gif", "n_menu_01_off.gif"],
>        [1,  "n_menu_02_on.gif", "n_menu_02_off.gif"],
>        [2,  "n_menu_03_on.gif", "n_menu_03_off.gif"],
>        [3,  "n_menu_04_on.gif", "n_menu_04_off.gif"],
>        [4,  "n_menu_05_on.gif", "n_menu_05_off.gif"],
>        [5,  "n_menu_13_on.gif", "n_menu_13_off.gif"],
>        [6,  "n_menu_06_on.gif", "n_menu_06_off.gif"],
>        [7,  "n_menu_07_on.gif", "n_menu_07_off.gif"],
>        [8,  "n_menu_08_on.gif", "n_menu_08_off.gif"]
>];
>
>function cmChange(num)
>{
>        topCat.img[num].src = menuImgSvr + catMenu[num][1];
>        
>        if (typeof(subCat) == "object")
>                for (var i = 0; i < catMenu.length; i++)
>                {
>                        if (catMenu[i][0] >= 0)
>                                subCat[catMenu[i][0]].style.display = ((i == num) ? "" : "none");
>                }
>}
>
>function cmUnchange(num)
>{
>        topCat.img[num].src = menuImgSvr + catMenu[num][2];
>
>        if (typeof(subCat) == "object")
>                for (var i = 0; i < catMenu.length; i++)
>                {
>                        if (catMenu[i][0] >= 0)
>                                subCat[catMenu[i][0]].style.display = "none";
>                }
>}
></script>
><style type='text/css'>
><!--
>a:link    {text-decoration:none;}
>a:visited {text-decoration:none;}
>a:active  {text-decoration:none;}
>a:hover  {text-decoration:none}
>
>BODY,TD,SELECT,input,DIV,form,TEXTAREA,center,option,pre,br, {font-size:9pt;font-family:verdana;}
>BODY { margin:0 0 0 0}
>//-->
></style>
><center>
><table width="600" border="0" cellspacing="0" cellpadding="0">
>        <tr>
>                <td>
>                        <a href="./menu.html" target=main>
>                        <img name="img" id="img" src="image/n_menu_01_off.gif" border="0" onmouseover="cmChange(0)" onmouseout="cmUnchange(0)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./about.html" target=main>
>                        <img name="img" id="img" src="image/n_menu_02_off.gif" border="0" onmouseover="cmChange(1)" onmouseout="cmUnchange(1)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./bbs/zboard.php?id=study" target=main>
>                        <img name="img" id="img" src="image/n_menu_03_off.gif" border="0" onmouseover="cmChange(2)" onmouseout="cmUnchange(2)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./bbs/zboard.php?id=diary" target=main>
>                        <img name="img" id="img" src="image/n_menu_04_off.gif" border="0" onmouseover="cmChange(3)" onmouseout="cmUnchange(3)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./bbs/zboard.php?id=picture" target=main>
>                        <img name="img" id="img" src="image/n_menu_05_off.gif" border="0" onmouseover="cmChange(4)" onmouseout="cmUnchange(4)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./bbs/zboard.php?id=suda" target=main>
>                        <img name="img" id="img" src="image/n_menu_06_off.gif" border="0" onmouseover="cmChange(5)" onmouseout="cmUnchange(5)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./bbs/zboard.php?id=guest" target=main>
>                        <img name="img" id="img" src="image/n_menu_07_off.gif" border="0" onmouseover="cmChange(6)" onmouseout="cmUnchange(6)"></a>
>                </td>
>                <td>   </td>
>                <td>
>                        <a href="./link.html" target=main>
>                        <img name="img" id="img" src="image/n_menu_08_off.gif" border="0" onmouseover="cmChange(7)" onmouseout="cmUnchange(7)"></a>
>                </td>
>        </tr>
></table>
></center>
>