V4 ;o)
Is this not the simplest working solution ?

// GPL (c) 2009 by DBJ.ORG
function isFunction(x) {
                 switch (typeof x) {
                        case "function" : return true ;
                        case "object"   : return (x + "").match(/
function/) !== null ;
                        default    : return false ;
                 }
         }

isFunction( top.alert )
/*
true
*/
isFunction( isFunction )
/*
true
*/

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