Hello Jonathan,
Actually, yes it is possible to disable the continue/submit button and display an animated gif.
Edit your includes/view-functions.php file, search around line 1830 and you should find these lines:
<link rel="stylesheet" type="text/css" href="{$css_dir}view.css" media="all" />
<script type="text/javascript" src="js/view.js"></script>
{$calendar_js}
Right below those lines, insert this block of code:
<script type="text/javascript" src="js/jquery/jquery-core.js"></script>
<script>
$(document).ready(function(){
var upload_prop = $("form").attr("enctype");
var show_progress = false;
if(upload_prop == 'multipart/form-data'){
show_progress = true;
$("form").submit(function(){
$("#saveForm").val("Uploading... Please wait...");
$("#saveForm").attr("disabled","disabled");
$("#li_buttons").append("<img src=\"images/loader-red.gif\" />");
});
}
});
</script>
That would display an animated gif when your files being uploaded.