jQuery - Check multiple text input

<form id="frmF" onsubmit="return checkToSubmit();">
<input type="text" name="phone[]" value="" />
<input type="text" name="phone[]" value="" />
<input type="text" name="phone[]" value="" />
<input type="text" name="phone[]" value="" />
<input type="text" name="phone[]" value="" />
<input type=submit value="OK" />
</form>


function checkToSubmit() {
var valid = true;
$('input[name="phone[]"]', '#frmF').each(function(){var v = $(this).val(); if (!v.match(/^[0-9]+$/)) {alert('Digits'); valid = false; $(this).focus(); return false;/*to break .each!*/}});
return valid;
}