Im having trouble calling my speed for my plugin. The code following is not the extent of my plugin, it is just for testing. Basic Plugin:

(function($) {

    $.fn.colorspan = function(options) {
        var settings = {
            speed: 800
        };

        if (options) {
            $.extend(settings, options);
        }
        
        function testFunction() {
            $('div').append("Howdy folks
");
        }
        
        timer = setInterval(function() {
            testFunction();
        }, settings.speed);
    };
})(jQuery);

This works:

$('div').colorspan();

This doesn't work:

$('div').colorspan(speed:'100');

Test Case: http://jsfiddle.net/john_motyl/yETC3/