// The plugin code
(function($){
    $.fn.parallax = function(options){
        var $$ = $(this);
        var offset = $$.offset();
        var top = parseInt($$.css('top'));
        if(top){
        var rif = offset.top-top;
        }else{
        var rif = offset.top;
        }
        var defaults = {
            "coeff": 0.95,
            "left" : 0,
            "start" : 0
        };
        var opts = $.extend(defaults, options);
        return this.each(function(){
            $(window).bind('scroll', function() {
                windowTop = $(window).scrollTop();
				newCoord = ((windowTop)-rif) * opts.coeff+opts.start;
                    $$.css({
                        "background-position":opts.left+" "+ newCoord + "px"
                    });

            });
        });
    };
})(jQuery);