Prepend icons for username and password

<!-- file: hooks/header-extras.php -->
<script>
    prependIcons();
    function prependIcons() { $j(function() { prependIcon('username', 'user'); prependIcon('password', 'lock'); }); }
    function prependIcon(name, icon = "cog") { var f = $j("#" + name); var fg = f.closest(".form-group"); fg.prepend(jQuery('<div class="input-group"/>').prepend($j('<div class="input-group-addon">').append($j("<i/>").addClass('glyphicon glyphicon-' + icon))).append(f)); fg.prepend($j('label[for="' + name + '"]')); }
</script>