plupload upload before submitting form

plupload-formsubmit.js

// Client side form validation
	$("form").submit(function(e) {
		var uploader = $("#uploader").pluploadQueue();

		// Validate number of uploaded files
		if (uploader.total.uploaded == 0) {
			// Files in queue upload them first
			if (uploader.files.length > 0) {
				// When all files are uploaded submit form
				uploader.bind("StateChanged", function() {
					if (uploader.total.uploaded == uploader.files.length)
						$("form").submit();
				});

				uploader.start();
			} else
				alert("You must at least upload one file.");

			e.preventDefault();
		}
	});