error message

i just typed my first jquery program like this.

$(document).ready(function() {

$('span.pq').each(function() {

var quote = $(this).clone();

quote.removeClass('pq');

quote.addClass('pullquote');

$(this).before(quote);

});//end each

});//end ready

in an html file that is attached to a jquery file, but unfortunately my browser provide an error massege like this.

Untitled-2.htm:10 Uncaught ReferenceError: $ is not defined. can anybody here help me with that? thanks

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