大侠给看看这个script判断FORM的语句怎么无法执行

[zjh3131505]

<SCRIPT language="JavaScript1.2">
function checkdata(theform)
{
if(theform.s2.value=="")
{
alert("您没有完成必要信息");
return false;
}
}
</SCRIPT>
<FORM action="tijaoo.asp" method="post" >
<TBODY>
<TR><TD width="6%"><div align="center">内容</div></TD>
<TD> <textarea id="textarea" name="s2" rows=5 style="WIDTH: 800px"></textarea></TD>
</TR>
<TR>
<TD align=left height=40>
<TABLE border=0 cellPadding=0 cellSpacing=0 width="100%">
<TBODY>
<TR>
<TD align=middle width="12%"><INPUT class="stbtm" name="Submit2" onclick="return checkdata(this.form)" style="COLOR: red" type="submit" value="确认留言">
</TD></TR></TBODY></TABLE></TD></TR></FORM>

大侠帮我看看上面那script判断语句 怎么无法触发 急啊 本人菜鸟 大侠给改该 或者有合适的代码也行 ！！！！

[sy_binbin]

<FORM name="form1" action="tijaoo.asp" method="post" >

[ttt2]

<SCRIPT language="JavaScript1.2">
function checkdata(theform)
{
if(theform.s2.value=="")
{
alert("您没有完成必要信息");
return false;
}
}
</SCRIPT>
<FORM action="tijaoo.asp" method="post" >
<TBODY>
<TR> <TD width="6%"> <div align="center">内容 </div> </TD>
<TD> <textarea id="textarea" name="s2" rows=5 style="WIDTH: 800px"></textarea> </TD>
</TR>
<TR>
<TD align=left height=40>
<TABLE border=0 cellPadding=0 cellSpacing=0 width="100%">
<TBODY>
<TR>
<TD align=middle width="12%"> <INPUT class="stbtm" name="Submit2" onclick="checkdata(this.form)" style="COLOR: red" type="button" value="确认留言">
</TD> </TR> </TBODY> </TABLE> </TD> </TR> </FORM>

[chenyanm]

<TD align=middle width="12%"> <INPUT class="stbtm" name="Submit2" onclick="checkdata(this.form)" style="COLOR: red" type="button" value="确认留言">

[chenyanm]

<TD align=middle width="12%"> <INPUT class="stbtm" name="Submit2" onclick="checkdata(this.form)" style="COLOR: red" type="button" value="确认留言">

[zjh3131505]

2楼 我太爱你了