I'm trying to ensure that at least one checkbox is selected. I'm using the query validate plugin.

here is the checkbox html
HTML Code:
 <!-- Checkbox -->
<div class="control-group">
	<label class="control-label" for="checkboxes">Checkboxes</label>
	<div class="controls">
		<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Students">Students<br>
    		<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Alumni">Alumni<br>
    		<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Business">Business<br>
    		<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Faculty">Faculty<br>
	</div><!-- close controls -->
</div> <!-- close control group -->
Here is all of the html:
HTML Code:
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">

    <title>jQuery Validate Example | aLittleCode</title>
    
	  <meta name="viewport" content="width=device-width">

    <link href="style.css" rel="stylesheet">
    <!-- js files linked at bottom -->

  </head>
  <body>
	<div class="container">
	    
	    <div class="page-header">
		    <h1>jQuery Validate Example</h1>
		    <p>with styles from Twitter Bootstrap</p>
	    </div>

		<div class="row">
		<div class="span12">
			<form action="" id="contact-form" class="form-horizontal">
			
			<fieldset>
			    <legend>Sample Contact Form <small>(will not submit any information)</small></legend>
			    

			    <!-- password INPUT -->
			    <div class="control-group">
			      <label class="control-label" for="password">password</label>
			      <div class="controls">
			        <input id="password" name="password" type="password" maxlength="50" value="" class="input-xlarge">
			      </div> <!-- close controls -->
			    </div><!-- close control group -->

			    <!-- password confirm INPUT -->
			    <div class="control-group">
			      <label class="control-label" for="password_confirm">password confirm</label>
			      <div class="controls">
			        <input id="password_confirm" name="password_confirm" type="password" maxlength="50" value="" class="input-xlarge">
			      </div> <!-- close controls -->
			    </div><!-- close control group -->

			    <!-- TEXT INPUT -->
			    <div class="control-group">
			      <label class="control-label" for="name">Your Name</label>
			      <div class="controls">
			        <input type="text" class="input-xlarge" name="name" id="name">
			      </div> <!-- close controls -->
			    </div><!-- close control group -->

			    <!-- EMAIL - text input area -->
			    <div class="control-group">
			      <label class="control-label" for="email">Email Address</label>
			      <div class="controls">
			        <input type="text" class="input-xlarge" name="email" id="email">
			      </div><!-- close controls -->
			    </div><!-- close control group -->

			    <!-- Text area -->
			    <div class="control-group">
			      <label class="control-label" for="message">Your Message</label>
			      <div class="controls">
			        <textarea class="input-xlarge" name="message" id="message" rows="3"></textarea>
			      </div><!-- close controls -->
			    </div> <!-- close control group -->

			    <!-- select - drop down -->
			    <div class="control-group">
			      <label class="control-label" for="select">Make Selection</label>
			      <div class="controls">
			        <select name="select" id="select" class="input-xlarge" >
        				<option value="">Select Request Type</option>
        				<option value="1">1</option>
        				<option value="2">2</option>
        				<option value="3">3</option>         
    				</select>
			      </div><!-- close controls -->
			    </div> <!-- close control group -->

			    <!-- Checkbox -->
			    <div class="control-group">
			      <label class="control-label" for="checkboxes">Checkboxes</label>
			      <div class="controls">
			        <input type="checkbox" name="checkboxes[]" id='checkboxes' value="Students">Students<br>
    				<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Alumni">Alumni<br>
    				<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Business">Business<br>
    				<input type="checkbox" name="checkboxes[]" id='checkboxes' value="Faculty">Faculty<br>
			      </div><!-- close controls -->
			    </div> <!-- close control group -->

			    <!-- Radio -->
			    <div class="control-group">
			      <label class="control-label" for="radio">Radio</label>
			      <div class="controls">
			        <input type="radio" name="radio" id='radio' value="yes">Yes<br>
				    <input type="radio" name="radio" id='radio' value="no" checked="">No
			      </div><!-- close controls -->
			    </div> <!-- close control group -->

      		<div class="form-actions">
            <button type="submit" class="btn btn-primary btn-large">Submit</button>
		      <button class="btn">Cancel</button>
			</div>
			</fieldset>
			</form>
		</div><!-- .span -->
		

		<!-- <div class="offset1 span2">
			<div class="well">
				<h2>Links</h2>
				<h3>Validate Plugin</h3>
				<ul>
					<li><a href="http://docs.jquery.com/Plugins/Validation/">jQuery Validate Plugin</a></li>
					<li><a href="http://docs.jquery.com/Plugins/Validation/validate#toptions">Plugin Options</a></li>
					<li><a href="http://bassistance.de/jquery-plugins/jquery-plugin-validation/">Author's Plugin Page</a></li>
					<li><a href="https://github.com/jzaefferer/jquery-validation">Github Repository</a></li>
				</ul>
				<h3>Other Assets</h3>
				<ul>
					<li><a href="http://webdesign.tutsplus.com/freebies/exclusive-freebie-the-kudos-web-icon-set/">Kudos Web Icons (free)</a></li>
					<li><a href="http://twitter.github.com/bootstrap/">Twitter Bootstrap</a></li>
				</ul>
			</div>
		</div> --><!-- .span -->
	</div><!-- .row -->

      <hr>

      <footer>
       
      </footer>


    </div> <!-- .container -->

<!-- ==============================================
		 JavaScript below! 															-->

<!-- jQuery via Google + local fallback, see h5bp.com -->
	  <script src="assets/js/jquery-1.7.1.min.js"></script>

<!-- Validate plugin -->
		<script src="assets/js/jquery.validate.min.js"></script>
    
<!-- Scripts specific to this page -->
		<script src="script.js"></script>

  </body>
</html>
Here is my js
Code:
$(document).ready(function(){

	// Validate
	// http://bassistance.de/jquery-plugins/jquery-plugin-validation/
	// http://docs.jquery.com/Plugins/Validation/
	// http://docs.jquery.com/Plugins/Validation/validate#toptions
	
		$('#contact-form').validate({
	    rules: {
	      
	      name: {
	        minlength: 2,
	        required: true
	      },
	      
	      email: {
	        required: true,
	        email: true
	      },
	      
	      subject: {
	      	minlength: 2,
	        required: true
	      },
	      
	      message: {
	        minlength: 2,
	        required: true
	      },

	      select: {
	        
	        required: true
	      },

	      password: { 
                required: true, 
                minlength: 5 
            }, 
	      
	      password_confirm: { 
	            required: true, 
	            minlength: 5, 
	            equalTo: "#password" 
	        },

          checkboxes: { 
          	//required: true,
          	//minlength: 1
            required: function(elem)
            {
                return $("input.select:checked").length > 0;
            }
             
          }
	    },
	    messages: { 
            name: "Enter your name",

            password: { 
                required: "Provide a password", 
                rangelength: jQuery.format("Enter at least {0} characters") 
            },

            password_confirm: { 
                required: "Repeat your password", 
                minlength: jQuery.format("Enter at least {0} characters"), 
                equalTo: "Enter the same password as above" 
            }, 

            email: { 
                required: "Please enter a valid email address", 
                minlength: "Please enter a valid email address", 
                remote: jQuery.format("{0} is already in use") 
            },   
            
        },
	    highlight: function(label) {
	    	$(label).closest('.control-group').addClass('error');
	    },
	    success: function(label) {
	    	label
	    		.text('OK!').addClass('valid')
	    		.closest('.control-group').addClass('success');
	    }
	     
	  });
	  
}); // end document.ready
I was trying to keep it as simple as possible and found this example here on site point but it doesn't seem to work how i'm using it. Also i have tried it with and without the array[] added onto the checkboxes. I'm using the [] to process it on the php side
Code:
checkboxes: { 
          	
            required: function(elem)
            {
                return $("input.select:checked").length > 0;
            }
             
}