如何使用JSONP的回调？

I have read up a lot on stackoverflow about everything on JSONP.

I am trying to get images from my web service but due to some domain policy, I have to use JSONP.

So currently here is my codes to get JSONP's data.

$.ajax({
    url: 'http://example.com/1?callback=test',
    type: 'GET',
    dataType: 'jsonp',
    success: function(test) {
        var content = ' ';
        for(var i=0; i<test.length;i++) {
            if(test.status == 0) {
                content += '<img src="' + result.images[i].s3File.url +'">';
            }
        }

        $( ".images" ).HTML(content);
    }
});

So what I am currently getting is..

Uncaught SyntaxError: Unexpected token : http://example.com/1?callback=test?jQuery191014008507528342307_1414476410551&_=1414476410552:1

I read up a lot on this topic about the callback, but I really have no idea how do I use the callback function to retrieve the images. Can someone please teach me?