X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=src%2Fcore.js;h=c095f741a8886eeee1b4bf1a755ed3045a980e8e;hb=69212c501f8875b4650847053cc41eaa470e5848;hp=7db0a8c9b15654dc8359057bfc74669119947095;hpb=43c4b64f328c5d6f2642f6dcf33eb27c377c0491;p=jquery.git

diff --git a/src/core.js b/src/core.js
index 7db0a8c..c095f74 100644
--- a/src/core.js
+++ b/src/core.js
@@ -613,9 +613,10 @@ jQuery.extend({
 	},
 
 	// See test/unit/core.js for details concerning this function.
+	// Since 1.3 DOM methods and function like alert
+	// aren't supported. They return false on IE (#2968).
 	isFunction: function( fn ) {
-		return !!fn && typeof fn != "string" && !fn.nodeName &&
-			fn.constructor != Array && /^[\s[]?function/.test( fn + "" );
+		return fn instanceof Function;
 	},
 
 	// check if an element is in a (or is an) XML document