Login/ID password system for website

I need a login/password ID system created for my website. This needs to also correspond and work with the shopping cart system that is already in place on my website ([login to view URL]). Go to [login to view URL] and hit sign in: This basically exactly how I want my login/password system on my website scripted. I want the font style and graphics to flow with or above the current system I have in place. I was not happy with the last company that worked on the programming for my website. I need to have the admin panel checked to make sure all glitches and or hang ups are corrected. Take the shopping cart status off test mode and make the cart live. Make sure the shopping cart operates corrrectly on the front end and back end of the website. I can guide you to the problems I am seeing with the cart and or its backend. They appear to be minimal but nonetheless they need to be corrected asap. I need all references to the previous web company taken from my website. I need the programmer to make sure that the back end (admin panel) functions the way that it was designed to do. I.E. Does the content management system within the cart work properly, etc. I need an excellent programmer that can handle simple coding logic. This is not hard. You need to definitely be more than proficient in php, etc. If you do not complete the work to my satisfaction you will not get paid. Its that simple.