jQuery is not defined. And how to solve it

Question

This must be quite trivial, but I tried everything. This is my page: http://www.titabonatsou.gr/big-nothing.html

FYI: It should showcase a slider in the middle of the page. But I still get an error of "Uncaught ReferenceError: jQuery is not defined"

jQuery is not defined here in my code:

    jQuery(document).ready(function($) {
      var si = $('#gallery-1').royalSlider(
.
.
.
.

.{

I read about cases that .htaccess does the damage for forbidding hotlinking or permission to the folder that jquery is are forbidden.

What should I do?

Answer 1

Your jQuery file is empty. Please redownload it from http://jquery.com/download/ and check if your src for the file is correct

Answer 2

the code you enter can work only after jquery is loaded in your page, may be you use it before your jquery reference

Answer 3

You didn't include jquery library into your page. Put <script src="http://code.jquery.com/jquery-1.10.2.js"></script> in your head tag. In order to check document ready you can do like this:

$(function(){
  // document ready
});