Adding a value from a text box without a Form Submit

Experts, in a related post, I received a solution of listing out the 2 teams for different games.
There is a "Choose!" button next to each team which:
-  Allows the user to Choose one of the 2 teams
-  Inserts that Choice into the database with the

<input type="submit" value="Choose!" onClick="_submit('<?=$gameid?>','<?=$fav?>')";>

Since each line has it's own submit button, the Form itself does not have one.
This has been working fine, but...

Recently, I realized that I needed to add ONE text field to allow the users to type in the total number of points (INT) as a tiebreaker...

Something like this:
echo "<CENTER>For Tiebreaker, Enter total points in Game #10 above: <input name='Tiebreaker' type='text' size='5' maxlength='5'></CENTER>";      

Since the form itself doesn't have a submit button, I would like to
-  Have the user enter their number in the box
-  Click a SUBMIT NUMBER button right next to the text box
-  Have the number insert into the database
INSERT INTO TIEBREAKERS SET
userid = '$MemberID'
tiebreaker = //Number from the Text Box

-  And have the text box show the chosen number after it's entered into the database (in case the user wants to change it)

Thanks in advance,

-Dan

<script>
function _submit(teamid,selection) {
document.form.teamid.value=teamid;
document.form.selection.value=selection;
}

function validateForm(frm) {
	alert(frm.teamid.value + "\n\n" + frm.selection.value);
	return false;
}
</script>


if($_POST) {
 
$finalPID = $_POST["teamid"];
$finalselection = $_POST["selection"];

//add to database
//refresh page

}

<input type="submit" value="Choose!" onClick="_submit('<?=$gameid?>','<?=$fav?>')";>

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