求助，为什么onsubmit不执行
<script Language="JavaScript"> function formck(myform1) { if (myform1.m1.value == "") { alert("提示：新密码不能为空！"); myform1.m1.focus(); return (false); } if (myform1.m2.value == "") { alert("提示：请再次确认新密码！"); myform1.m2.focus(); return (false); } if (myform1.m1.value.length < 6 || myform1.m1.value.length > 15) { alert("提示：填写6-15位密码！"); myform1.m1.focus(); return (false); } if (myform1.m2.value != myform1.m1.value) { alert("两次输入密码不同！"); myform1.2.focus(); return (false); } return true }</script><form action="" method="post" name="myform1" id="myform1" onsubmit="return formck(this)"> <tr align="left"> <td height="25" align="left">新密码：</td> <td height="25" colspan="2"><input type="password" name="m1" size="20" /></td> </tr> <tr align="left"> <td height="25" align="left">确认新密码：</td> <td height="25" colspan="2"><input type="password" name="m2" size="20" /></td> </tr> <tr align="center" valign="top"> <td colspan="3"><input type="submit" name="Submit" value=" 送出 "/></td> </tr></form>