If you don't want to use Javascript, but do use HTML5, you can use the attribute formaction
:
<!DOCTYPE html>
<html>
<body>
<form>
<input type="submit" formaction="http://firsttarget.com" value="Submit to first" />
<input type="submit" formaction="http://secondtarget.com" value="Submit to second" />
</form>
</body>
</html>
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