function toggle_div(id) {

	var my_div = $(id);
	if (my_div.getStyle('display') == 'none') {
		my_div.show();
	} else {
		my_div.hide();
	}
};

function check_file_form(id) {

	// Controllo per il file
	if ($(id).value.length == 0) {
		alert('Select at least a file');
		return false;
	} else {
		alert('Select at least a file');
        }
        	return true;
};

function file_attach() {

	if ($('with_file').value == 'false')
		$('with_file').value = 'true';
	else
		$('with_file').value = 'false';

}