help pre-empt head scratching. Will this work ok?

here is a plan for a database interface. Please let me know if there are things here that won't work. Also, I'm open to suggestions as to alternatives that will work better in terms of security, user interface or whatever other relevant aspects.

I'm presenting this outline before ciunstructing the site in hopes that more experienced
developers might save me some "barking up the wrong tree" time.

default.htm;
frameset with two frames on left margin and one main view

nav.asp;
presents login form that posts username and password to
server.checks submitted username and password against database and if they match sends;

1)html code for two select controls defining what user wants to do and which tables he wants to do them to (I want to[view,edit, update,delete][book,user,purchase,publisher]listing)and a button.

2)javascript code onclick of the button stringing together selected values of the two select controls, a switch with 16 cases, each calling a function that will use document.write to present appropriate submit form to dbfunctions.asp in the bottom left margin frame.

dbfunctions.asp;

presents in main view frame another submit form in if neccessary to get values for the database operation, performs data base operation, and presents view of changed listing in the main view frame.

Thanks