[nikita.mmf]

Object.equal = function( firstObj, secondObject ){
	var keysFirstObj = Object.keys( firstObj );
	var keysSecondObject = Object.keys( secondObject );
	if ( keysFirstObj.length != keysSecondObject.length ) {
		return false;
	}
	return !keysFirstObj.filter(function( key ){
		if ( typeof firstObj[key] == "object" ||  Array.isArray( firstObj[key] ) ) {
			return !Object.equal(firstObj[key], secondObject[key]);
		} else {
			return firstObj[key] !== secondObject[key];
		}
	}).length;
}
alert(Object.equal({a:[1,2,{b:1}], c: {d:[1,2,3]}},{a:[1,2,{b:1}], c: {d:[1,2,3]}}));