calling a function

[EcLip_e]

i found this code off of php.net ( http://us4.php.net/manual/en/function.parse-url.php) and i'm a little confused on how i'm suppose to use it. here's the code:

  function RemoveArgFromURL($URL,$Arg)
  {
   $Pos = strpos($URL,"$Arg=");

   if ($Pos)
   {
     if ($URL[$Pos-1] == "&")
     {
       // If Pos-1 is pointing to a '&' knock Pos back 1 so its removed.
       $Pos--;
     }
     $nMax = strlen($URL);
     $nEndPos = strpos($URL,"&",$Pos+1);

 if ($nEndPos === false)
 {
   // $Arg is on the end of the URL
   $URL = substr($URL,0,$Pos);
 }
 else
 {
   // $Arg is in the URL
   $URL = str_replace(substr($URL,$Pos,$nEndPos-$Pos),'',$URL);
 }
   }
   return $URL;
  }

i copied and pasted this code into a file that i include for every page. my question is, how do i call the function for the URL that i want to use it in, and do i have to declare which param i want to remove?

[superwormy]

$result = RemoveArgFromUrl (" your url here ", " your arg here ");