You will need to user a server-side language to send mail. mailto: in HTML is long obsolete.
For a simple PHP form feedback script see:- http://www.thesitewizard.com/archive/feedbackphp.shtml
Be aware that this forum is not a free coding service. As a general rule, the people helping out in this forum don't write code for others (especially code that appears to be for commercial use)), but try to help with fixing code that doesn't work. You'll be far more likely to get help if you have made a substantial effort and written some code yourself. Then someone here will almost certainly help you correct/improve your work.
All advice is supplied packaged by intellectual weight, and not by volume. Contents may settle slightly in transit.