MySQL login with PHP

[crashmaster]

Hi there,

I have db with users. username could be [A-Z][a-z] [0-9][.-_]

When the user is login PHP script do this ->

 

mysql_query ("SELECT * FROM users WHERE username='$_POST[username]' AND password='md5($_POST[password]' LIMIT 1");

 

But user has to enter his name exactly for exmpl.: CrUelB.oy

 

What I want is a possibility to enter nickname without case sensetivity.. for example: cruelb.oy

 

Can anybody help me ?