[Wolves] Replacing globals on with off php

[Wayne Morris]

Got an old bit of php (a classified ads site ) which I like but used 
'register globals on' and I understand this is not a good idea.
So can someone give me a starter for ten to get rid of the globals bit 
(don't really understand how they worked anyway)  eg in this snippit 
which is for logon:

function verifyUser()
     {
         global $ADMIN_EMAIL;
         session_start();
         global $email, $passwd;
         if( session_is_registered( "email" ) && session_is_registered( 
"passwd" ) )
         {
             $result = mysql_query( "SELECT email, passwd FROM user 
WHERE email='$email' AND BINARY passwd='$passwd'" ) or error( "Login 
failed, please contact <a href=\"$ADMIN_EMAIL\">adminstrator</a>" );
             if( mysql_num_rows( $result ) == 1 ) return true;
         }
         return false;
     }
     function verifyAdmin()
     {
         session_start();
         global $ADMIN_NAME, $ADMIN_PASS, $adminPasswd, $adminName;
         if( session_is_registered( "adminName" ) && 
session_is_registered( "adminPasswd" ) )
         {
             if( $adminName == $ADMIN_NAME && $adminPasswd == $ADMIN_PASS )
                 return true;
         }
         return false;
     }

cheers