cors checker

(function() {
    var isCorsEnabled = function(tag) {
        var corsEnabled;
        var target = $(tag)[0];
        var currentSrcUrl = target.src.split("_t=").join("_t=1"); // add a leading 1 to the ts

        $.ajax({
                url: currentSrcUrl,
                async: false
            })
            .done(function() {
                // things worked out, we can add the CORS attribute and reset the source
                target.crossOrigin = "anonymous";
                target.src = currentSrcUrl;
                corsEnabled = true;
            })
            .fail(function() {
                corsEnabled = false;
            });
        return corsEnabled;
    }
    window.isCorsEnabled = isCorsEnabled
}())