The breadcrumb separator

The breadcrumb separator shows a broken image link. How can I sort this out permanently?

For it to work I have to modify the function agua_breadcrumb on FULL_PATH_TO_IMAGE as below..

function agua_breadcrumb($breadcrumb) {
  if (!empty($breadcrumb)) {
    // Use separator defined by theme settings
    $separator = '<img src="FULL_PATH_TO_IMAGE" />';
    return '<div id="breadcrumbs">'. implode(' '. $separator .' ', $breadcrumb) .'</div>';
  }
}