Submit form using a button outside the tag

Say I have:

<form method="get" action="something.php">
    <input type="text" name="name" />
</form>

<input type="submit" />

How do I go about submitting that form with that submit button outside of the form, I think in HTML5 theres an action attribute for the submit but I’m not sure if thats fully cross-browser and if it isn’t is there anyway to do this?