<script language="JavaScript" type="text/javascript">
<!--
function sendForm(obj) {
    obj.value='Transfer information';
    //obj.form.submit();
obj.disabled='disabled';
 }
//-->
</script>
<?php
if(isset($_POST['submit1'])) {
...
...
...
}
?>

<form id="form1" name="form1" enctype="multipart/form-data" method="post" action="">

<input type="submit" name="submit1" value="Change" onclick="sendForm(this);" />