Figured it out....In case anyone else needs it:

The login code is found here:

Your correct, it can be prevented in browsers, but for my need it was necessary. Our development team built a nurse system, built around the dotnetnuke framework. They asked me to incorporate active directory, and to make it COMPLETELY seamless. Orginally I did setup active directory but kept the forms authentication enabled the web.config, which allowed for them to logout, etc. My development team didnt like that due to the account login was confusing ( the two buttons standard, windows login ) and the iframe was causing double credential checks., so I then enabled windows authentication in web.config which fixed they things forms authentication didnt. BUT, with one draw back, they couldnt logout. because of the limitation of asp.net and logging out of windows authentication, I had 2 possibilities to work with, 1 close the browser on logout or 2 find a way to clear credentials both using javascript. So all and all it worked out doing what i did, our nurses arent exactly computer savy.