<?php
echo "<form enctype='multipart/form-data' action='group.php?id=$group[id]&ok' method='post'>";
echo "<input name='file' type='file' accept='image/*,image/jpeg' /><br/>";
echo "<input style='padding:2px;' type='submit' value='Выгрузить' />";
echo "<a style='padding:2px;display:inline-block;' href='group.php?id=$group[id]'>Отмена</a>";
echo "</form>";
?>