I'm now working with AJAX and I noticed that I cannot use
load() function with JQuery,
$('#content').load('http://localhost/HTML/acerca_de.html' , '#content');
I loaded a file on my local host and tried to print it at the html page with the id content.
Edit: thanks for the answers, at the end it was a problem with the version of JQuery, i had the slim version, and i need full version one, i instaled it and now i can work with AJAX