$.validator.addMethod( "mobileRU", function( phone_number, element ) {
	var ruPhone_number = phone_number.replace( /\(|\)|\s+|-/g, "" );
	return this.optional( element ) || ruPhone_number.length > 9 && /^((\+7|7|8)+([0-9]){10})$/.test( ruPhone_number );
}, "Please specify a valid mobile number." );
