Functional format is best for those who are switching their career or have large employment gaps on their resume. In this format, you dont have to list the joining or resigning dates of the previous employments. Functional format will hide your employment gaps or your job switching.
An attractive resume template/outline makes it more powerful. Just as dressing smartly helps a candidate in an interview good formatting does the same for a resume. Looks do matter at all places in the real world and on paper. When you present yourself well you get noticed. Similarly when you present a good resume it will be noticed; otherwise it would be very easily find a bin to rest in.
Functional Sample When you are referring the online resume samples, you will need a functional sample if you have employment gaps in your past. Functional format does not draw attention towards the gaps in employment history of the applicant. Rather it focuses on the existing skills of the applicant. It will explain to the employer about how these skills can help to benefit the company.
Avoid being vague If you have references include them. Dont say available upon request. If you have gaps in employment explain them clearly. They will probably come up in the interview anyways. Being prepared in advance by giving complete information in your resume is better than being caught off guard in the interview or worse skipped over all together.
Use good quality paper and a laser printer Dont skimp on paper quality with your resume it leaves a bad impression. Poor quality paper creases and wrinkles easier. Use a laser printer to make sure your resume doesnt smudge or smear. Always use white paper for easier photocopying and avoid color in your resume. Black and white is the way to go.