jquery_object_size.js

// usage: var size = $.size( selectorOrObject );
// code borrowed from: http://stackoverflow.com/questions/5223/length-of-javascript-associative-array

$.size = function(obj){
        
        if ( typeof obj === 'object' ) {

                var size = 0, key;

                for (key in obj) {

                        if ( obj.hasOwnProperty( key ) ) {

                                size++;
                        }
                }

                return size;

        } else {

                return $( obj ).size();
        }
};