关于网站代码的问题，

<!-- CSS部分 ##### 请修改为自己的样式--> <STYLE type=text/css> .sec1 { cursor: hand;background:#CCCCCC;} .sec2 { font-weight:: bold; cursor: hand;background:#FFFFFF;} .layer {border:#CCCCCC 1px solid; width:400px;} </STYLE> <!--JavaScript部分--> <SCRIPT language=javascript> <!-- function secBoard(n) { for(i=0;i<secTable.cells.length;i++) secTable.cells[i].className=sec1; secTable.cells[n].className=sec2; for(i=0;i<mainTable.tBodies.length;i++) mainTable.tBodies[i].style.display=none; mainTable.tBodies[n].style.display=block; } //--> </SCRIPT> <!--HTML部分--> <div class=layer> <TABLE id=secTable cellSpacing=0 cellPadding=0 width=400 height=25 border=0 > <TR align=middle height=25> <TD class=sec2 onclick=secBoard(0)> 推荐</TD> <TD class=sec1 onclick=secBoard(1)> 电影</TD> <TD class=sec1 onclick=secBoard(2)> 剧集</TD> <TD class=sec1 onclick=secBoard(3)> 音乐</TD> </TR> </TABLE> <TABLE id=mainTable width=400 border=0> <TBODY style=DISPLAY: block> <TR> <TD> <TABLE width=99% border=0> <TBODY> <TR> <td valign=middle>推荐</td> </TR> </TBODY> </TABLE> </TD></TR></TBODY> <TBODY style=DISPLAY: none> <TR> <TD> <TABLE width=99% border=0> <TBODY> <TR> <td valign=middle>电影</td> </TR> </TBODY> </TABLE> </TD></TR></TBODY> <TBODY style=DISPLAY: none> <TR> <TD> <TABLE width=99% border=0> <TBODY> <TR> <td valign=middle>剧集</td> </TR> </TBODY> </TABLE> </TD></TR></TBODY> <TBODY style=DISPLAY: none> <TR> <TD> <table width=99% border=0> <tbody> <tr> <td valign=middle>音乐</td> </tr> </tbody> </table> </TD> </TR></TBODY></TABLE> </div>