Can someone help me "fix" or tweak the Navtrail breadcrumb plugin?

For the life of me, I can’t figure out how to turn the last segment of the navtrail OFF. I don’t want the last segment to be a link. I tried returning the value of the loop count ($i) and the $len, or number of SEGS, and they never match. I’m assuming that if they match, the last link turns off. This plugin is very close to what I need, as the structure of the site I’m on is rather arbitrary, so I sort of need to run the breadcrumb off the url segments.

Sample output:

Home > Service > Services 1 4 > Article 2 4 > Article Title 3 4

The first number is the loop count (I think) and the second is the results from $len = count($IN->SEGS);. I’m not sure that helps, but It seems like there should be some way to know you’re on the last segment and not make that a link.

And while we’re at it, is there an easy way (preg_replace or some thing like that…) to ignore certain segments? The only real arbitrary segment in my site is “Article”. I’d like the above trail to look like this, ideally:

Home > Service > Services > Article Title

In case you don’t have the plugin handy, here are relevant pieces. In the second one, I don’t feel like that last else statement ever really does anything.

function navTrail()
{
  global $IN;

  $len = count($IN->SEGS);
  for ($i=1; $i<=$len; $i++)
  {
   if ($IN->SEGS[$i])
   {
     $this->sections[] = $IN->SEGS[$i];
   }
  }
}

The main loop is here. I’ve picked my way through PHP before, but this one is just giving me fits.

if(trim($this->sections[0]) != trim($is_default))
   {
    $this->return_data = '<a href="http://.$_SERVERSCRIPT_NAME">.'"]Home</a>'.DELIMIT;
    $path = $_SERVER['SCRIPT_NAME']."/".$this->sections[0];
    $this->return_data .= '<a href="http://.$path.">'.$this->format($this->sections[0]);_   _    $len = count($this->sections);_    for ($i=1; $i<$len; ++$i)_    {_     if(!is_numeric($this->sections[$i]))_     {_      $path .= "/".$this->sections[$i];_      if(isset($this->sections[$i+1]) and is_numeric($this->sections[$i+1]))_      {_       $path .= "/".$this->sections[$i+1];_       $this->return_data .= DELIMIT.'<a href="'.$path.'">'.$this->format($this->sections[$i]).'</a>';
      }
      else
      {
       $this->return_data .= DELIMIT.'<a href="http://.$path.">'.$this->format($this->sections[$i]).'</a>';
       
      }
     }
    }
   }
  }
  return $this->return_data;
 }

Maybe someone could at least explain what a couple of these lines are doing in plain language so I can tweak it myself?

if(isset($this->sections[$i+1]) and is_numeric($this->sections[$i+1]))

What is that? If there is another section? Why “is_numeric”?

Thanks for any help.