Untitled

<script type="text/javascript">
window.addEvent('domready', function() {
var count = 0;
$('p#add_field').click(function(){
count += 1;
$('#container').append(
'<strong>Link #' + count + '</strong><br />' + '<input id="field_' + count + '" name="fields[]' + '" type="text" /><br />' );
});
});
</script>

<div id="container">
        <p id="add_field"><a href="#"><span>&raquo; Add your favourite links.....</span></a></p>
    </div>

jQuery(document).ready(function() {
  //do stuff
})

<script type="text/javascript">
    $(function() {//shorthand way of doing document.ready
        var count = 0;
        $('p#add_field').click(function(){
            count += 1;
            $('#container').append(
                '<strong>Link #' + count + '</strong><br />' + '<input id="field_' + count + '" name="fields[]' + '" type="text" /><br />' );
        });
    });
</script>

$document =& JFactory::getDocument();
$document->addScript("jquery-1.8.1.min.js");
$js = " $(document).ready(function() {
    var count = 0;
    $('p#add_field').click(function(){
      count += 1;
      $('#container').append('<strong>Link #' + count + '</strong><br />' + '<input id="field_' + count + '" name="fields[]' + '" type="text" /><br />' );
    });
});";
$document->addScriptDeclaration($js);

<head>
    <script type="text/javascript" src="jquery-1.7.2.min.js"></script>
    <script>
        var count = 0;
        $(document).ready(function() {
            $('p#add_field').click(function(){
                count += 1;
                $('#container').append('<strong>Link #' + count + '</strong><br />' + '<input id="field_' + count + '" name="fields[]' + '" type="text" /><br />' );
            });
        });
    </script>
</head>