Wordpress - PHP Script Login User + Register User

1 - need php script that will fire and receive 2 post variables as 2 - AJAX CALL (JS CODE TO FIRE THE LOGIN SCRIPT) 3 - LOGIN PHP SCRIPT POST VARIABLE PAYLOAD - user_name - user_password 4 - script needs to login the user 5 - script needs to include wp-load at top 6 - script needs to send response of success or failer 7 - js code needs to update H1 tag with the response of either - server down 500 - username incorrect - password incorrect - logging you in 8 - if successful -> js code needs to -> redirect user -> [login to view URL] $BIDS OVER $50 WON'T BE HIRED. ** EXPLAIN JOB TO ME IN YOUR BID OR I WON'T RESPOND TO YOU. ** How long do you need?