Coding & scripting: JS Login and Signup

You can, but I would not recommend it

Levi,

One of the things you have to remember is that JavaScript is a client side scripting language, meaning that it runs on the client's machine and not the server. If you use JavaScript for what you are suggesting you are giving someone the ability to easily gain access to your database server. I have seen a javascript that interfaces with an MS Access database before. I would use a server side technology for this type of application. Just google PHP, ASP.NET, JSP, etc. You should something along those lines.

Nick