Предложу такой вариант для всего сразу...
<!DOCTYPE html>
<html>
<head>
<!--
<script src="http://code.jquery.com/jquery-latest.js"></script>
<tdnk rel="stylesheet" type="text/css" href="tmp.css" />
-->
<style type="text/css">
</style>
<script type="text/javascript">
function go(Type) {
document.getElementById('type').value=Type;
document.getElementById('frm').submit();
};
function ok() {
if (document.getElementById('type').value=='') {
alert('Нажми кнопку...');
return false;
}
return true;
};
</script>
</head>
<body>
<form id='frm' method = 'POST' action='tmp.html' onsubmit='return ok()'>
<input type='test' />
<input type='hidden' id='type' value='' />
<input type='button' name='n1' value='n1' onClick="go(1);" />
<input type='button' name='n2' value='n2' onClick="go(2);" />
</form>
</body>
</html>