Conflict between files

Conflict between files

Hi, Is my first post in forum.jquery. 

I'm doing my first web page and i have the following problem.

I charge the following files in head of the next page:  http://www.enkuadre.cl/?page_id=221


<head>
<script type="text/javascript" src="http://www.enkuadre.cl/wp-content/themes/twentyten-child/iconos/jquery.fancybox.pack.js"></script>

<link href="http://www.enkuadre.cl/wp-content/themes/twentyten-child/wpsc-default.css" rel="stylesheet" />
<link rel="stylesheet" type="text/css" media="all" href="http://www.enkuadre.cl/wp-content/themes/twentyten-child/scrollfix/cascadaoriginal.css"> 

<script type='text/javascript' src='http://www.enkuadre.cl/wp-content/themes/twentyten-child/iconos/prototype.js'></script>

<script type="text/javascript" src="http://www.enkuadre.cl/wp-content/themes/twentyten-child/scrollfix/jquery-1.7.1.js"></script>

<script type="text/javascript" src="http://www.enkuadre.cl/wp-content/themes/twentyten-child/scrollfix/principal.js"></script>

<script type="text/javascript" src="http://www.enkuadre.cl/wp-content/themes/twentyten-child/scrollfix/mis12.js"></script>

</head>

And report the next problem on bug of google chrome

  1. Uncaught ReferenceError: jQuery is not defined jquery.fancybox.pack.js:46
  2. Uncaught TypeError: Object [object Object] has no method 'dispatchEvent'prototype.js:5733
    1. Uncaught ReferenceError: Effect is not defined ?page_id=221:1714
      1. onmouseover ?page_id=221:1714
    1. Uncaught ReferenceError: Effect is not defined ?page_id=221:1714
      1. onmouseout ?page_id=221:1714









I don´t know how to fix the problem, someone could help me, I am amateur in web development.

Thanks