ASP.Net Post-back Breaks jQuery FancyBox

I have a FancyBox help link, on an ASP.Net aspx page, that is registered as such:

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
    <script type="text/javascript" src="fancybox/jquery.fancybox-1.3.4.js"></script>
    <link rel="stylesheet" type="text/css" href="fancybox/jquery.fancybox-1.3.4.css" media="screen" />

    <script type="text/javascript">
        $(document).ready(function() {

        $("#help").fancybox({
            'width': '90%',
            'height': '90%',
            'autoScale': true,
            'transitionIn': 'elastic',
            'transitionOut': 'none',
            'titleShow': false,
            'type': 'iframe'
        });

    });
  </script>

It works fine, but after 2 post backs (still works after 1) an exeption is thrown here (in fancybox.js) saying 'wrap' is not an object, when I click the help link:

    $.fancybox.center = function() {
    var view, align;

    if (busy) {
      开发者_JAVA百科  return; 
    }

    align = arguments[0] === true ? 1 : 0;
    view = _get_viewport();

    if (!align && (wrap.width() > view[0] || wrap.height() > view[1])) {
        return; 
    }

After the third post back, an error is thrown before the page is completely loaded within the jquery.js file Microsoft JScript runtime error: Object doesn't support this property or method pointing no where in peticular.

Any ideas why post backs would be breaking fancybox?

The solution is add "lazy_loader".

This will load your fancybox classes in each postback

<script type="text/javascript">
    $(document).ready(function () {
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(lazy_loader);
        lazy_loader();
    });

    function lazy_loader() {
        $("#help").fancybox({
            'width': '90%',
            'height': '90%',
            'autoScale': true,
            'transitionIn': 'elastic',
            'transitionOut': 'none',
            'titleShow': false,
            'type': 'iframe'
        });
    }
</script>

This should work just fine