表单提交为什么得到的是空值 高手请进 解决立即给分

<script language="javascript">
function chk_eu()
{
if (eumem.ebusiness.value==""||eumem.ebusiness.value.indexOf("'",0)!=-1)
{
alert("经营类型为空或包含非法字符");
document.eumem.ebusiness.focus();
return;
}
if (eumem.eaddress.value==""||eumem.eaddress.value.indexOf("'",0)!=-1)
{
alert("详细地址为空或包含非法字符");
document.eumem.eaddress.focus();
return;
}
if (eumem.etel.value==""||eumem.etel.value.indexOf("'",0)!=-1)
{
alert("联系电话为空或包含非法字符");
document.eumem.etel.focus();
return;
}
if (eumem.ewebsite.value==""||eumem.ewebsite.value.indexOf("'",0)!=-1)
{
alert("商家网站为空或包含非法字符");
document.eumem.ewebsite.focus();
return;
}
if (eumem.ebiaopic.value==""||eumem.ebiaopic.value.indexOf("'",0)!=-1)
{
alert("商家图片为空或包含非法字符");
document.eumem.ebiaopic.focus();
return;
}
//if (eumem.ecultrue.value==""||eumem.ecultrue.value.indexOf("'",0)!=-1)
//{
// alert("商家文化为空或包含非法字符");
// document.eumem.ecultrue.focus();
// return;
//}
//eumem.action="eum.asp"
eumem.submit();
}
</script>

＃＃＃＃＃＃＃＃＃＃＃＃＃
<form name="eumem" action="modifyinfo.asp" method="post" ENCTYPE="MULTIPART/FORM-DATA">
<table width="100%" border="0" class="body">
<tr>
<td align="right">商家名称:</td>
<td ><input type="text" name="ename" maxlength="50" value="<%=ename%>"></td>
</tr>
<tr>
<td align="right">经营类型:</td>
<td><input type="text" name="ebusiness" maxlength="50" value="<%=ebusiness%>"></td>
</tr>
<tr>
<td align="right">详细地址:</td>
<td><input type="text" name="eaddress" maxlength="120" value="<%=eaddress%>"></td>
</tr>
<tr>
<td align="right">联系电话:</td>
<td><input type="text" name="etel" maxlength="52" value="<%=etel%>"></td>
</tr>
<tr>
<td align="right">商家网站:</td>
<td><input type="text" name="ewebsite" maxlength="100" value="<%=ewebsite%>"></td>
</tr>
<tr>
<td align="right">标志图片:</td>
<td><input type="file" name="ebiaopic"></td>
</tr>
<tr>
<td align="right">商家简介:</td>
<td>
<input type="hidden" name="ecultrue" value="<%=ecultrue%>">
</td>
</tr>

<tr>
<td colspan="2" align="center"><input type="button" name="btn_next" value="下一步" onclick="chk_eu();"></td>
</tr>
</table>
</form>