我的代码有问题，那位大虾帮忙看一下？

把onmouseover和onmouseout的相应代码拷到显示它们的td的里面去
是在某个标题td上移动就显示层
要不你的层本来就隐藏, 永远不会有MM_showHideLayers事件 <td width="132" onmouseover="MM_showHideLayers('Layer1','','hide','Layer2','','hide','Layer3','','hide','Layer4','','hide','Layer5','','hide','Layer6','','hide','Layer7','','show')"
onmouseout="MM_showHideLayers('Layer1','','hide','Layer2','','hide','Layer3','','hide','Layer4','','hide','Layer5','','hide','Layer6','','hide','Layer7','','hide')">学科建设简报</td>