PHP - Session / Design

[albertocelta]

I have created the required functionality for my page and now I want to work on design. I created a login php code and it works perfectly, and then created a php using Dreamweaver. Thus created html tags, etc... I then created a nice design with the tables how I wanted,  and wanted to put the "Login" part on the right hand side (In a table). When I did so, it gave me the following error:

 

Warning: Cannot modify header information - headers already sent by (output started at C:\wamp\www\Login\index.php:15) in C:\wamp\www\Login\login.php on line 58

 

On line 58 of my code, is where I have "if the username & password" is incorrect, go back to the home page.  So what i have there is a header =("login.php");. My login.php  code has a session session_start();

 

The question I have, is to see if someone could describe to me how everything works. How do I design a page, and then incorporate a login script in that page. How should the sessions be,  how can I design in dreamweaver and use php code, etc..  Some information to get me back to working because right now I am I am stuck. Information will be great,  thanks in advance...

[lemmin]

There is a sticky about this.

http://www.phpfreaks.com/forums/index.php/topic,37442.0.html

[nathanmaxsonadil]

you can't have any html output before you put a session start or header.....