<script language="javascript" src="formValidate_ajax.js"></script>
<script language="javascript" src="formValidate.js"></script>
<form id="form1" name="form1" method="post" action="">
<input name="textfield" type="text" id="userName" />
<br />
<input name="username" type="text" id="userID" />
<input name="check" type="button" id="check" onclick="check_username();" value="检测" />
<input name="commit" type="submit" id="commit" value="提交" />
</form>
