$web = Invoke-WebRequest -Uri https://www.btopenzone.com:8443/home -UseBasicParsing
$loggedIn = $web.Content | Select-String -Pattern 'now logged in'

if ($loggedIn -eq $null) {
    $postParams = @{username='XXX';password='XXX';provider='tbb|business|btoz'}
    $login = Invoke-WebRequest -Uri https://www.btopenzone.com:8443/ante -UseBasicParsing -Method POST -Body $postParams

    $checkLogin = $login.Content | Select-String -Pattern 'now logged in'
    if ($checkLogin -eq $null) {
        "Logged in!"
    } else {
        "Couldnt log in."
    }
} else {
    "Already logged in."
}