Populating Mailto With Variables Contained In List

I am planning on using the maito form with Javascript. I have a form and it is structured in the following fashion:
<form>
<b>Subject </b> <input type="text" name="subject" size="30"><br>
<b>Person 1 <b><input type="checkbox" name="email" value="person1@email.com"><br>
<b>Person 2 <b><input type="checkbox" name="email" value="person2@email.com"><br>
<b>Person 3 <b><input type="checkbox" name="email" value="person3@email.com"><br>
<input type="submit" onclick="submit">
</form>

What I am trying to do with Javascript is that you fill out the subject name and then you select which recipients of email you want to receive the email. So if I select Checkbox 1 and Checkbox 3 then when I click submit, it opens my Outlook and the To is filled in with person1@email.com;person2@email.com. So I guess I would need the javascript to populate and <href mailto: form after checking which names are checked and then populating the mailto with the variable that contains the list of names I chose. Right now we have a clunky method using the mailto but I don't have the option of choosing who it mails to so when I send it, I send the mail to everyone, even those on vacation.