Multiple images within a slide

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Hey all. I am trying to modify the stock image slider to allow each slide to have two images selected. Thought it would be pretty easy but I ran into a snag.

var attachFileManagerLaunch = function($obj) {
            $obj.click(function(){
                var oldLauncher = $(this);
                ConcreteFileManager.launchDialog(function (data) {
                    ConcreteFileManager.getFileDetails(data.fID, function(r) {
                        jQuery.fn.dialog.hideLoader();
                        var file = r.files[0];
                        oldLauncher.html(file.resultsThumbnailImg);
                        oldLauncher.next('.image-fID').val(file.fID)
                    });
                });
            });
        }
        var attachFileManagerLaunch2 = function($obj) {
            $obj.click(function(){ //alert('wooohoooo');


with this i get an error AFTER selecting an image from the file manager that says...
{"error":{"message":"The identifier fID is missing for a query of Concrete\\Core\\File\\File"},"errors":["The identifier fID is missing for a query of Concrete\\Core\\File\\File"]}

what am i missing? why is it referencing fID when I am trying to manipulate fID2?

Thank you in advance for any insight.
Cheers,
Chris