Bug in import address for CSS file

The original code assumes that drupal is installed in the site root. This needs to be changed to account for drupal installations that might be in a subfolder. Here is the original code:

function advuser_init() {
  $headhtml = "<style type='text/css'>@import \"/". drupal_get_path("module", "advuser") ."/advuser.css\";</style>";
  drupal_set_html_head($headhtml);
}

Here is the code that fixes the problem:

function advuser_init() {
  $headhtml = "<style type='text/css'>@import \"". base_path() . drupal_get_path("module", "advuser") ."/advuser.css\";</style>";
  drupal_set_html_head($headhtml);
}