textarea有限制?

我把源代码贴给大家:
<%@LANGUAGE="VBSCRIPT" CODEPAGE="CP_ACP"%>
<!--#include file="../include/news_conn.asp" -->
 <% 
 dim editflag,editid
 editid=Cint(request("editid"))
 editflag=Cint(request("editflag"))
 set news_rs=server.createobject("adodb.recordset")
if editflag=1 then
searchstr="select * from news_2 where ID = "&editid
news_rs.open searchstr,oconn,2,3
elseif editflag <> 1 then
searchstr=""
end if
%>   
<html>
<head>
<title>世恒公司后台维护-文件编辑</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<LINK href="css/style.css" rel="stylesheet" type="text/css">
<!--监测是否是被编辑状态--> 
<SCRIPT LANGUAGE="JavaScript">
function editbegin()
{
if(<%= Cint(editflag) %> != 1)
  {alert("请输入文章标题的关键字进行查询!");
  }if(<%= Cint(editflag) %>==1)
{
   <% if searchstr <> "" then %>
   <% if news_rs.eof then %>
   news_body.news_title.value="";
   news_body.news_body.value="";
   <% elseif not news_rs.eof then
    %>
    news_body.news_title.disabled='';
  
   news_body.news_title.value="<%= news_rs("newstitle") %>";
    news_body.news_body.disabled='';
     news_body.news_body.value="<%= news_rs("newsbody") %>";
 news_body.news_title.focus();
 <% 
 end if %>
   <% end if %>
   }
}function format()
{
var rangetext=document.selection.createRange().text;
var into=document.news_body.news_body.value.indexOf(rangetext,1);
if (rangetext=="" || into==-1)
alert("你没选中文本框中的文本");
else
{
document.selection.createRange().text='<b>'+document.selection.createRange().text+'</b>';

}
}
function kongge(str){
var old=window.clipboardData.getData("text");
window.clipboardData.setData("text",str);
news_body.news_body.focus();
document.execCommand('Paste');
window.clipboardData.setData("text",old);
}
function huanhang(str){
var old=window.clipboardData.getData("text");
window.clipboardData.setData("text",str);
news_body.news_body.focus();
document.execCommand('Paste');
window.clipboardData.setData("text",old);
}
</script>
</head><body topmargin="0" rightmargin="0" leftmargin="0"  onLoad="editbegin();">
<table width="790" height="576" border="0" align="center" cellpadding="0" cellspacing="0" >
  <tr>
    <td height="20" bgcolor="#e6f0ff">目前位置：修改文件-2</td>
  </tr>
  <tr>
    <td height="556">  
      <table width="700" height="424" border="0" align="center" cellpadding="0" cellspacing="0">
        <tr> 
          <td width="23%" height="22" >&nbsp;</td>
          <td width="77%" >&nbsp;</td>
        </tr>
        <tr> 
          <td height="20" >&nbsp;</td>
          <td height="26" align="center"><form name="search" method="post" >
              <input type="text" name="searchTxt"  onFocus="searchTxt.value=''"  onBlur="if(this.value=='')searchTxt.value='输入关键字'" value="输入关键字">
              &nbsp;&nbsp;<a href="#" onClick="gosearch();"><img src="images/go.gif" name="goSearch" width="19" height="19" border="0"></a></form></td>
        </tr>
        <tr> 
          <td height="24" >&nbsp;</td>
          <td  align="center"> <input type="button" name="edit" value="开始修改" > 
          </td>
        </tr>
        <form name="news_body" action="newsbo_redirect.asp" method="post">
          <tr> 
            <td height="20" >文件标题：</td>
            <td ><input type="text" size="80" name="news_title" disabled="True"></td>
          </tr>
          <tr> 
            <td >文件内容：</td>
            <td rowspan="5" ><textarea name="news_body" rows="40" cols="90" disabled="true"></textarea></td>
          </tr>
          <tr> 
            <td ><input type="hidden" name="editID" size="4"></td>
          </tr>
          <tr> 
            <td ><input type="button" name="bold" value="&nbsp;B&nbsp;" onClick="format();">
              <input type="button" name="inite" value="&nbsp;I&nbsp;">
              <input type="button" name="underline" value="&nbsp;U&nbsp;"></td>
          </tr>
          <tr>
            <td height="16" ><input type="button" value="空格" onClick="kongge('chr(32)')" ><input type="button" value="换行" onClick="huanhang('<br>')" ></td>
          </tr>
          <tr> 
            <td height="246" >&nbsp;</td>
          </tr>
          <tr> 
            <td height="21" >&nbsp;</td>
            <td  ><input type="submit" name="news_tijiao" value="修改" ><%= editflag%><%= editid%>  </td>
          </tr>
        </form>
      </table>
      <p>&nbsp;</p></td>
  </tr>
</table>
</body>
</html>