jQuery getJSON works locally, but not cross domain

I've searched FOREVER and can't come up with a definitive answer to my problem. So here it is. I have a JSON file (I went to jsonlint to validate and it says its good) that looks like this (some information modified):

[{
        "position":"1",
        "category":"A",
        "title":"Title to first story",
        "description":"The first story."
    },
    {
        "position":"2",
        "category":"B",
        "title":"Title to second story",
        "description":"The second story"
    },
    {
        "position":"3",
        "category":"B",
        "title":"Title to third story",
        "description":"The third story"
    }
]

I used jQuery to parse through and put on an html page using this function:

$.getJSON('page.json', function(data) {
  var items = [];

  $.each(data.reponse, function(item, i) {
    items.push('<li id="' + i.position + '">' + i.title + ' - ' + i.description + '</li>');
  });

  $('<ul/>', {
    'class': 'my-new-list',
    html: items.join('')
  }).appendTo('body');
});

It works perfectly! Now comes my issue, the JSON file will not be hosted locally, and will in fact be hosted on a separate domain. So I modified my code as follows (after some reading) hoping to get it working:

$.getJSON('http://www.otherdomain.com/page.json?format=json&callback=?', function(data) {
  var items = [];

  $.each(data.reponse, function(item, i) {
    items.push('<li id="' + i.position + '">' + i.title + ' - ' + i.description + '</li>');
  });

  $('<ul/>', {
    'class': 'my-new-list',
    html: items.join('')
  }).appendTo('body');
});

By adding the 'callback' line I stopped getting a "Failed to load resource" error. However, nothing is happening. It is like the function I added isn't even there. I tried to take all of it out and add a simple 'alert(data)', but that didn't even fire. What am I doing wrong? A big problem is that I am 100% limited to just HTML and JavaScript to work (not my choice). Thanks for any help!

EDIT Ok, I don't have ability for the other server to dynamically add anything to the json file. So I modified by hardcoding a function around the json (smaller sample):

storyData(
[{
        "position":"1",
        "category":"A",
        "title":"Title to first story",
        "description":"The first story."
    }
])

Everything now works! Thanks for all the help!