Question : Can a submit button open multiple windows?

I have a form in a php doc that opens
<form target="_blank" method="POST" action="voucher_verify.php?id=3">
...  input fields ....
<input name="voucher_submit" type="submit" value="Print Voucher">
</form>

Upon clicking submit, the form opens a new window that inserts the information into a sql db, and creates a form to be printed.
However, the page where the submit button resides stays open.

I want to to work so that when you click submit, it opens the new window the way it does now, but also redirect the current page back to anything else ... (i.e. index.php)
I tried some java, which is probably the best method - I'm just doing it wrong.

I tried something along the lines of <input name="voucher_submit" type="submit" onclick="index.php" value="Print Voucher">

Please help

Answer : Can a submit button open multiple windows?

All you need is to correct your code this way:

 <input name="voucher_submit" type="submit" onclick="location.replace('index.php');" value="Print Voucher">

Best regards