Fancybox 2 - if no "id" class exists, don't use these fancybox options

Question

Having difficulty getting fancybox options to show up only when my lightbox link has an id class in it. Here's what I have so far (which breaks it, and just goes straight to the image in a new page):

<script type="text/javascript">
    var thisHash = window.location.hash;
    $(document).ready(function() {
        $(".fancybox").fancybox({
            helpers : { 
                title : { type : 'inside' }
            }, // helpers
            beforeShow : function() {  //Where my issue starts
                if(typeof(this.element.attr("id")) !== 'undefined'){ 
                    this.title = (window.location + '#' + this.element.attr("id"));  
            }, // beforeShow
        }); // fancybox
        if (thisHash) {
            $(thisHash).trigger('click');
        }
    }); // ready
</script>

Any suggestions? I thought filtering for "undefined" would do it, since when the id class is missing it normally returns "undefined" when I echo it, but maybe I'm just not using correct syntax for this since this is javascript and I've been dealing with PHP mostly.