diff --git a/jquery.cycle.all.js b/jquery.cycle.all.js
index dc474ea..f1c0f74 100644
--- a/jquery.cycle.all.js
+++ b/jquery.cycle.all.js
@@ -226,7 +226,10 @@ function buildOptions($cont, $slides, els, options, o) {
 	var startingSlideSpecified;
 	// support metadata plugin (v1.0 and v2.0)
 	var opts = $.extend({}, $.fn.cycle.defaults, options || {}, $.metadata ? $cont.metadata() : $.meta ? $cont.data() : {});
-	var meta = $.isFunction($cont.data) ? $cont.data(opts.metaAttr) : null;
+	var meta = null;
+	if (typeof $cont.data(opts.metaAttr) === 'function') {
+		meta = $cont.data(opts.metaAttr)
+	}
 	if (meta)
 		opts = $.extend(opts, meta);
 	if (opts.autostop)
@@ -464,7 +467,7 @@ function buildOptions($cont, $slides, els, options, o) {
 	// run transition init fn
 	if (!opts.multiFx) {
 		var init = $.fn.cycle.transitions[opts.fx];
-		if ($.isFunction(init))
+		if (typeof init == 'function')
 			init($cont, $slides, opts);
 		else if (opts.fx != 'custom' && !opts.multiFx) {
 			log('unknown transition: ' + opts.fx,'; slideshow terminating');
@@ -609,7 +612,7 @@ $.fn.cycle.resetState = function(opts, fx) {
 
 	// re-init
 	var init = $.fn.cycle.transitions[fx];
-	if ($.isFunction(init))
+	if (typeof init == 'function')
 		init(opts.$cont, $(opts.elements), opts);
 };
 
@@ -700,7 +703,7 @@ function go(els, opts, manual, fwd) {
 		opts.busy = 1;
 		if (opts.fxFn) // fx function provided?
 			opts.fxFn(curr, next, opts, after, fwd, manual && opts.fastOnEvent);
-		else if ($.isFunction($.fn.cycle[opts.fx])) // fx plugin ?
+		else if (typeof $.fn.cycle[opts.fx] == 'function')
 			$.fn.cycle[opts.fx](curr, next, opts, after, fwd, manual && opts.fastOnEvent);
 		else
 			$.fn.cycle.custom(curr, next, opts, after, fwd, manual && opts.fastOnEvent);
@@ -825,7 +828,7 @@ function advance(opts, moveForward) {
 	}
 
 	var cb = opts.onPrevNextEvent || opts.prevNextClick; // prevNextClick is deprecated
-	if ($.isFunction(cb))
+	if (typeof cb == 'function')
 		cb(val > 0, opts.nextSlide, els[opts.nextSlide]);
 	go(els, opts, 1, moveForward);
 	return false;