gistfile1.js

function extend( target ) {
	var input = slice.call( arguments, 1 ),
		inputIndex = 0,
		inputLength = input.length
		key,
		value;
	for ( ; inputIndex < inputLength; inputIndex++ ) {
		for ( key in input[inputIndex] ) {
			value = input[inputIndex];
			if (value !== undefined ) {
				target[key] = $.isPlainObject(value) ? extend( {}, value ) : value;
			}
		}
	}
}