jQuery parameters not passed to PHP

I am not sure why but jQuery is not passing parameters to PHP in order to complete the load() function with specific data based on the parameters ID.

In short term, when a user clicks a link there is onclick which fires up photo_tab('.$row['id'].');

account.php HTML element

<li><a href="#!/photos" onclick="photo_tab('.$row['id'].');"><i class="icon-camera"></i> Photos</a></li>

In a sence the ID should be passed to the photo_tab (the script is included into page not on the page it self)

general.js

function photo_tab(user_id) {
    $('.ac-content').load('ajax/photos.php',{user_id:id});
}

And photos/ page should be loaded which is a PHP page and based on the user_id value load photos from database associated with that user_id.

<?php
   if ($_GET['user_id'] == 2) {
      echo "WORKED!";
   } else {
      echo "FAILED!";
   } 

***this is the photos/ file located at ajax/photos.php with mod_rewrite to point
otherwise to just photos/ or photos

EDIT: 1 - Using full path instead of rewrite photos > ajax/photos.php does not work 2 - The ID is being passed and echoed onto page via $row['ID']; 3 - ajax/photos.php is using $_REQUEST

Solution

Try passing the data as a query string, like so:

function photo_tab(user_id) {
    $('.ac-content').load('photos/','user_id='+id);
}

EDIT: Giving this a second look, is that URL correct? It seems weird to have a relative URL.

You should also make sure the generated markup is correct, is the row ID printing out in the source?

EDIT 2: I set this up locally, this is working code, mimicking your file structure.

//localhost/account.php

<html>
<head>
    <script src="http://code.jquery.com/jquery.min.js"></script>
    <script>
        function photo_tab(id) {
            $('.ac-content').load(
                'ajax/photos.php',
                { 'user_id': id }
            );
        }
    </script>
</head>
<body>
    <div class="ac-content"></div>
    <a href="#!/photos" onclick="photo_tab(3);"><i class="icon-camera"></i> Photos</a>
</body>

//localhost/ajax/photos.php

<?php
if (isset($_GET['user_id']) && $_GET['user_id'] == 2)
{
    echo "WORKED!";
}
else
{
    echo "FAILED!";
}