So here is my question. Using javascript/jQuery I am currently loading in an XML file that has a file name such as carousel_large_2010-06-08.xml.. the way I am doing it is checked for todays date then grabbing a file that has that date in the filename... the issue is sometimes they wont be uploading a new file for a given day so it needs to fallback to a older date that exists.. Wondering how to do it? Here is my code:

        // set date for xml file
        var currentTime = new Date(),
            month = currentTime.getMonth() + 1,
            day = currentTime.getDate(),
            year = currentTime.getFullYear();

        if(month.toString().length == 1){
            month = '0'+month.toString();
        }
        if(day.toString().length == 1){
            day = '0'+day.toString();
        }

        var dateObject = year+"-"+month+"-"+day;

        // start magic
        $jq.ajax({
            type: "GET",
            url: "_xml/carousel/home/carousel_large_"+dateObject+".xml",
            dataType: "xml",
            success: HPCarousels.heroCarousel.parseXML,
            error: function(){
                alert('Error Loading XML Content');
            }
        });