jquery validator 验证

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<script type="text/javascript" src="E:\jquery.validate.js"></script>
<script type="text/javascript" src="E:\jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="E:\jquery.metadata.js"></script>
<html>
 <head>
  
  <title> New Document </title>
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
 
 </head>
 <body>    <p>        <label for="firstname">Firstname</label>        <input id="firstname" name="firstname" class="required" />    </p> <p>  <label for="email">E-Mail</label>  <input id="email" name="email" class="required email" /> </p> <p>  <label for="password">Password</label>  <input id="password" name="password" type="password" class="{required:true,minlength:5}" /> </p> <p>  <label for="confirm_password">确认密码</label>  <input id="confirm_password" name="confirm_password" type="password" class="{required:true,minlength:5,equalTo:'#password'}" /> </p>    <p>        <input class="submit" type="submit" value="Submit"/>    </p>
 </body>
</html>
<script>
  
$(function() { $("#signupForm").validate();});</script>jquery.validate.js老是报jquery未定义，另外validate()函数也不能用，关键我已经导入相关js文件，且路径也对的啊