$(document).ready not Working

Verify the following steps.

1. Did you include jquery
2. Check for errors in firebug

Those things should fix the problem

Instead of using this:

$(document).ready(function() { /* your code */ });

Use this:

jQuery(function($) { /* your code */ })(jQuery);

It is more concise and does the same thing, it also doesn't depend on the $ variable to be the jQuery object.

One possibility when ready stops working is that you have javascript code somewhere that is throwing an exception in a $(document).ready(...) or $(...) call, which is stopping processing of the rest of the ready blocks. Identify a single page on which this is occurring and examine it for possible errors in other places.