Uncaught ReferenceError when executing on different computer
<p>The below script works fine on one of my computers but when executing it on another I get <code>uncaught referenceerror $ is not defined</code>. It is the same error on another similar page. Also it says unable to load resource of the ajax.google... source.</p>

<pre><code>&lt;script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"&gt;&lt;/script&gt;

&lt;script type="text/javascript"&gt;
    //add dynamic fields to add more addresses
    $(document).ready(function() {
        $('#btnAdd').click(function() {
            var $address = $('#address');
            var num = $('.clonedAddress').length;
            var newNum = new Number(num + 1);
            var newElem = $address.clone().attr('id', 'address' + 
newNum).addClass('clonedAddress');

            //set all div id's and the input id's
            newElem.children('div').each (function (i) {
                this.id = 'input' + (newNum*11 + i);
            });
            newElem.find('input').each (function () {
                this.id = this.id + newNum;
                this.name = this.name + newNum;
            });

            if (num &gt; 0) {
                $('.clonedAddress:last').after(newElem);
            } else {
                $address.after(newElem);
            }


            $('#btnDel').removeAttr('disabled');

            if (newNum == 2) $('#btnAdd').attr('disabled', 'disabled');//number of 
field sets that can be added
        });
        $('#btnDel').click(function() {
            $('.clonedAddress:last').remove();
            $('#btnAdd').removeAttr('disabled');
            if ($('.clonedAddress').length == 0) {
                $('#btnDel').attr('disabled', 'disabled');
            }
        });
        $('#btnDel').attr('disabled', 'disabled');
    });
&lt;/script&gt;
</code></pre>
