Need help adding str_replace('-',' ',$name); to this simple script

[PicnicTutorials]

That (or a form of that) replaces "-" with a space. Can you please help me add that to this small breadcrumbs script? Or a version of your own making that does the same thing? Thanks

<?php 
$path = $_SERVER["PHP_SELF"];
$parts = explode('/',$path);
if (count($parts) < 2)
{
echo("home");
}
else
{
echo ("<a href=\"/index.php\">home</a> &raquo; ");
for ($i = 1; $i < count($parts); $i++)
    {
    if (!strstr($parts[$i],"."))
        {
        echo("<a href=\"");
        for ($j = 0; $j <= $i; $j++) {echo $parts[$j]."/";};
        echo("\">".$parts[$i]."</a> &raquo; ");
        }
    else
        {
        $str = $parts[$i];
        $pos = strrpos($str,".");
        $parts[$i] = substr($str, 0, $pos);
        echo $parts[$i];
        };
    };
};  
 			?>