$ (this) .qtip is not a function

I have code on my page that applies qtip to images. It displays dynamic content for each image through an ajax post. But it does not display qtip after closing the dialog box of the Thickbox / JQuery interface and causes an error: $ (this) .qtip is not a function

<script src="<%= Config.VirtualDir %>js/jquery.js?v=2" type="text/javascript"></script>
<script src="<%= Config.VirtualDir %>js/jquery.qtip-1.0.0-rc3.min.js?v=2" type="text/javascript"></script>

<script type="text/javascript" language="javascript">

$(document).ready(function() {
     BindQtip();
});
 function BindQtip()
 {
$('image').each(function(){
                        $(this).live('click',function() {
                            var $img = $(this);
                            if('<%= objAdminAuth.GetUserID() %>' == $img.attr('data-uid').split('|')[0])
                            {                                        
                                return false;
                            }
                           if ($img.data('qtip')) {return false;} 
                            $(this).qtip({
                                content: 'Loading...',
                                style: {
                                    border: {
                                        width: 5,
                                        radius: 10
                                    },
                                    padding: 0,
                                    textAlign: 'center',
                                    tip: true, // Give it a speech bubble tip with automatic corner detection
                                    name: 'dark' // Style it according to the preset 'cream' style
                                },
                                hide: 'unfocus',
                                show: {
                                    when: 'click', // Don't specify a show event
                                    ready: true, // Show the tooltip when ready
                                    solo: true
                                },
                                position: {
                                    corner: {
                                        tooltip: 'rightMiddle', // Use the corner...
                                        target: 'bottomLeft' // ...and opposite corner
                                    }
                                },
                                api: {
                                    // Retrieve the content when tooltip is first rendered
                                    onRender: function() {

                                        var self = this;
                                        self.content = '';
                                        $.ajax({
                                            url: window.location.href,
                                            type: 'POST',
                                            data: 'call=ajax&uid=' + $img.attr('data-uid'),
                                            success: function(resp) {
                                                self.updateContent(resp);
                                            }
                                        });

                                    },
                                    onContentUpdate: function() {
                                        var self = this;
                                    }
                                }
                            });
                        });
                        });
}
</script>

The whole way is right and everything works fine. Did I miss something?

Any help would be appreciated.