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onsubmit html form


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I'm trying to check a rule that if false an alert box pops up on submit and gives a message.  The user can then only select ok and fix the issue and the submit does not happen.

The condition that needs to be met is if $totalqty > $qty then pop up the alert box with message they need to fix before they can submit.

I've tried this:

if($totalqty > $qty)
{ echo '<form method="post" action="#" onsubmit="return confirm('You\'ve selected too many items please remove some before continuing.');">';
echo '<form method="post" action="#">';

The above allows the user to hit ok or cancel, I don't want them to be able to continue until they fix the issue.  So is there a way for the alert box to just have an OK button and it not submit?

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While the above worked a better solution was the following.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

<title>Form Check</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript">
function check() {
	var nmbr = document.getElementById("number").value;
	if (nmbr > 5){
		alert("the number is too high");
		return false;
	return true;

// -->
<h1>Form Check</h1>
<form action="#" method="get" onsubmit="check();">
<input type="text" name="number" id="number" value=""><br>
<input type="submit" name="submit" value="submit">

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