PowerShell v2 Function Switch ToParentFolder

A while back Jeff Hicks put some functions up to help navigate the file system a little more easily.  Somehow I pulled this (and one other) function-along with some aliases-to get around the system more quickly.  The aliases are w.stcf, down, and, d.  I use down the most.   The function lives in a Windows module, hence the Windows. in front of everything.

# Define function
function Windows.Switch-ToChildFolder {
 param(
  $Path = $PWD
 )

 pushd $pwd
 $dir = gci $path | Where {$_.PSIsContainer} | select fullname;
 if($dir.length -gt 0) {
  Write-Output "There are $($dir.length) children folders.";
  for($i = 1; $i -le $dir.length; $i++) {
  Write-Output "$($i): $($dir[($i-1)].fullname)";
 }
 $response = Read-Host "Type the number for the folder you want to select";
 cd $dir[$($response-1)].fullname | Out-Null;
 } else {
  Write-Output "The current directory has no children";
 }

} # end function Windows.Switch-ToChildFolder

# Set alias
Set-Alias -Name w.stcf -Value "Windows.Switch-ToChildFolder"
Set-Alias -Name Down -Value "Windows.Switch-ToChildFolder"
Set-Alias -Name d -Value "Windows.Switch-ToChildFolder"

The really cool thing here is that when you run the cmdlet it gives you a numbered list of folders into which you can go simply by typing the folder number.  For example, using down to navigate the $PSHOME directory gives me this:

PS C:> down $pshome
There are 4 children folders.
1: C:WindowsSystem32WindowsPowerShellv1.0en-US
2: C:WindowsSystem32WindowsPowerShellv1.0Examples
3: C:WindowsSystem32WindowsPowerShellv1.0Modules
4: C:WindowsSystem32WindowsPowerShellv1.0 estmodules
Type the number for the folder you want to select: 4
C:WindowsSystem32WindowsPowerShellv1.0 estmodules
PS C:WindowsSystem32WindowsPowerShellv1.0 estmodules>