(function($) {

$.fn.addimate = function(noOfImages, prefix, x, extension, interval) {

    if (x > noOfImages) {
        x = 1;
    }

    console.log($(this).attr("id") + "n" + prefix + x + extension + "n" + interval);
    $(this).attr("src", prefix + x + extension);
    x ++;

    setTimeout(function() {
        $(this).addimate(noOfImages, prefix, x, extension, interval);
    }, interval);
}

}) (jQuery);

(function($) {

$.fn.addimate = function(noOfImages, prefix, x, extension, interval) {

    //Intentionally deleted content.
}; //AND you're missing a semicolon here

}) (jQuery);

(function($) {

$.fn.addimate = function(noOfImages, prefix, x, extension, interval) {

    var $this = this; //This will maintain the context of the jQuery object.

    if (x > noOfImages) {
        x = 1;
    }

    console.log(this.attr("id") + "n" + prefix + x + extension + "n" + interval);
    this.attr("src", prefix + x + extension);
    x++;

    setTimeout(function() {
        $this.addimate(noOfImages, prefix, x, extension, interval);
    }, interval);
};

}(jQuery));