Execute php in new tab.

Hi all,
I need help to execute in new tab a php file via ajax.
I have this code:

<script type="text/javascript">
function registroClasse(arg1) {
    $.ajax({
        type: "POSTT",
        url: "registroClasse.php",
        data: {cla: arg1},
    })

}
</script>

Thanks.

Tegatti