Reusing a function

I want to reuse a function, first to browse out to a source folder and then again to browse out to the target folder.  Guess I just don't understand and could use some help.  Here is the script:

function Find-Folders {
    param ($Folder)
    [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
    $browse = New-Object System.Windows.Forms.FolderBrowserDialog
    $browse.SelectedPath = "C:\"
    $browse.ShowNewFolderButton = $True
    $browse.Description = "Select a " + $Folder + " folder"

    $loop = $true
        if ($browse.ShowDialog() -eq "OK")
        $loop = $false
		Write-Host "Your source is " $Folder
        } else
            $res = [System.Windows.Forms.MessageBox]::Show("You clicked Cancel. Would you like to try again or exit?", "Select a location", [System.Windows.Forms.MessageBoxButtons]::RetryCancel)
            if($res -eq "Cancel")
                #Ends script

Find-Folders Source

Find-Folders Target

I need to save the results of the function to a $sourceFolder variable and then to a $targetFolder variable, to reuse in a copy-item command.

Hope someone can help and thanks in advance.

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