Help creating an online form with dynamic "mailto"

Hello I'm trying to build an online form which has different recipients.

So i'd be something like:

Weather user select any of the optiions (where multiple recipients are) depending on that selection that's where the output will go to an specific email address.

How can this be possible?

Thanks.

Are you trying to use "mailto"? That is very, very unreliable for several reasons and is not recommended.

You should use a custom server-side form-mail script to transmit the mail depending on the recipients selected. PHP or PERL are the languages best suited.