PHP MySql throws an exception

[ERUM]

i m using php 4.4.0 and my sql version 4.1 and front end i m suing is sql yog

i provide userid/password as root/root to sql yog and it get connected with

my sql server .but when i give the same in application as follwoing

              $MM_conn_HOSTNAME = "localhost";
              $MM_conn_DATABASE = "database name";
               $MM_conn_USERNAME = "root";
               $MM_conn_PASSWORD = "root"; 

i encounter the follwoing error in browser !!


Warning: mysql_connect(): Access denied for user 'root'@'localhost' (using password: YES) in c:\inetpub\wwwroot\hsbc\wwwroot\connection.php on line 17
Access denied for user 'root'@'localhost' (using password: YES)
means sql yog allow me to connect with server(db server) with root/root credential but at applciation level i faced problem

i do not know what is unforseen problem i have

Required help....