Add handlers to web.config

new-handler.ps1

$webpath = 'E:\www\Sitecore8\Website\Web.config'

#var addElement = handlersCollection.CreateNewElement("add");
#addElement.Properties.Item("name").Value = "PHP-FastCGI";

[xml]$XmlDocument = Get-Content -Path $webpath

$handler = $XmlDocument.configuration.'system.webServer'.handlers.ChildNodes | Where-Object {$_.Name -eq 'CaptchaImage'}

if( $handler -eq $null )
{
    $lastElement = $XmlDocument.configuration.'system.webServer'.handlers.LastChild.Clone()
    $lastElement.name = 'CaptchaImage'
    $lastElement.path = 'CaptchaImage.axd'
    $lastElement.type = "Sitecore.Form.Core.Pipeline.RequestProcessor.CaptchaResolver, Sitecore.Forms.Core"
    $lastElement.verb="*"

    $XmlDocument.configuration.'system.webServer'.handlers.AppendChild($lastElement)
}

$handler = $XmlDocument.configuration.'system.webServer'.handlers.ChildNodes | Where-Object {$_.Name -eq 'CaptchaAudio'}

if( $handler -eq $null )
{
    $lastElement = $XmlDocument.configuration.'system.webServer'.handlers.LastChild.Clone()
    $lastElement.name = 'CaptchaAudio'
    $lastElement.path = 'CaptchaAudio.axd'
    $lastElement.type = "Sitecore.Form.Core.Pipeline.RequestProcessor.CaptchaResolver, Sitecore.Forms.Core"
    $lastElement.verb="*"
    $XmlDocument.configuration.'system.webServer'.handlers.AppendChild($lastElement)
}


$XmlDocument.Save($webpath);