鼠标滑过切换栏目-在IE和FIREFOX下兼容问题，小弟分不多了，见谅啊！ 先谢谢啦！

有了它 ：<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default"%>
在FIREFOX下我的鼠标事件无效 
没有它 
在IE和FIREFOX下我的部分CSS无效 
我的JS ：
<script language="javascript" type="text/javascript">
function showBlank(j,n,x,y,x_class,y_class){
//j:当前ID n:总数目 x,y:前缀 x_class,y_class:类名
  var  Norbal= new Array();
  var  Change= new Array();
  for(var i=0;i<n;i++){
  Norbal[i]=x+i;
  Change[i]=y+i;
  }
for(var i=0;i<n;i++){
if(i==j) {
document.all.item(Norbal[i]).style.display = "";
document.all.item(Change[i]).className=x_class;
        }
else{
document.all.item(Norbal[i]).style.display = "none";
document.all.item(Change[i]).className=y_class;
}
}}
</script>
-----------------------------------------------------------------
<table width="100%" cellpadding="0" cellspacing="0" class="bian">
                <tr>
                  <td>
  <table width="100%" height="24" border="0" align="center" cellpadding="0" cellspacing="0" background="img/menu_bg.gif" >
                      <tr>
                        <td align="center" class="head_tit3" id="so0" onmouseover="showBlank(0,6,'s','so','head_tit3','head_tit')">精简型</td>
                        <td align="center" class="head_tit" id="so1" onmouseover="showBlank(1,6,'s','so','head_tit2','head_tit')">普通型</td>
                        <td align="center" class="head_tit" id="so2" onmouseover="showBlank(2,6,'s','so','head_tit2','head_tit')">实用型</td>
                        <td align="center" class="head_tit" id="so3" onmouseover="showBlank(3,6,'s','so','head_tit2','head_tit')">标准型</td>
                        <td align="center" class="head_tit" id="so4" onmouseover="showBlank(4,6,'s','so','head_tit2','head_tit')">空间服务</td>
                        <td align="center" class="head_tit" id="so5" onmouseover="showBlank(5,6,'s','so','head_tit4','head_tit')">攒机指南</td>
                        </tr>
                  </table></td>
                </tr>
                <tr>
                  <td >
  <table width="100%" id="s0" style="display:; margin:0px">
                    <tr>
                      <td class="table_7"><table width="100%" border="0" cellspacing="0" cellpadding="0">
                        <tr>
                          <td width="60"><table width="50" height="40" border="0" cellpadding="0" cellspacing="0" class="bian_3">
                            <tr>
                              <td>&nbsp;</td>
                            </tr>
                          </table>
                            <table width="50" height="40" border="0" cellpadding="0" cellspacing="0" class="bian_3">
                              <tr>
                                <td>&nbsp;</td>
                              </tr>
                            </table>
                            <table width="50" height="40" border="0" cellpadding="0" cellspacing="0" class="bian_3">
                              <tr>
                                <td>&nbsp;</td>
                              </tr>
                            </table></td>
                          <td width="1px" background="img/line_mid.gif"></td>
                          <td class="table_5">111</td>
                          <td width="1px" background="img/line_mid.gif"></td>
                          <td class="wenzi_2">222</td>
                        </tr>
                      </table></td>
                    </tr>
                  </table>
  <table width="100%" id="s1" style="display:none; margin:0px">
                    <tr>
                      <td>111
  222</td>
                    </tr>
                  </table>
  <table width="100%" id="s2" style="display:none; margin:0px">
                    <tr>
                      <td>222
  333</td>
                    </tr>
                  </table>
  <table width="100%" id="s3" style="display:none; margin:0px">
                    <tr>
                      <td>333
  444</td>
                    </tr>
                  </table>
  <table width="100%" id="s4" style="display:none; margin:0px">
                    <tr>
                      <td>444
  555</td>
                    </tr>
                  </table>
  <table width="100%" id="s5" style="display:none; margin:0px">
                    <tr>
                      <td>666
  444</td>
                    </tr>
                  </table>
  </td>
                </tr>
              </table>