Create simple login & few database forms PHP-MySQL-AJAX-Captcha

Hi Can some one help in create ... A landing page with simple layout Simple registartion, Login , forgot password screens & Logout. I am using PHP, MySQL. You can use AJAX, HTML, DHTML, CSS, JQuery, CSS etc... Should wotk on PC, MAC & all tablets (iPAD, Samsung without UI issues) No Flash & Popup dialogue box's Once registration completes a mail will be sent to user to activate the account . (an encrypted link should be sent) Password should be stored in DB as encrypted one. For registration need to have Captcha (image imput) , but make it fully modular incase if my service provider don't have GD support i will pull it out. For login https should be used. After registration without authentication user can login to system. He can update his profile etc... But important task tabs / links will be in disabled state till user authenticates by clicking the link using his mail id. Put a small small button , Navigation link at to after login , enable it only when user authenticates . Make sure the code is fully modular and no scope for any kind of SQL injections. Password can be alfanumeric min 6 characters. User id is his mail id. Use name simply his name firstname , last name or only first name. Let me know if you need any more details on this. -Malla