change the root directory in nginx

[sayres]

Thisis my defualt config:
#
# The default server
#
server {
    listen       80;
    server_name  _;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm index.php;
    }

    error_page  404              /404.html;
    location = /404.html {
        root   /usr/share/nginx/html;
    }

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on
127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}

location /phpMyAdmin {
 alias   /usr/share/phpMyAdmin;
 index  index.php index.html index.htm;
 }

location ~ /phpMyAdmin/.*\.php$ {
 fastcgi_pass   127.0.0.1:9000;
 fastcgi_index  index.php;
 fastcgi_param  SCRIPT_FILENAME  /usr/share/$uri;
 fastcgi_intercept_errors on;
 include        fastcgi_params;
 }

 location ~ \.php$ {
 try_files $uri =404;
 root           /usr/share/nginx/html;
 fastcgi_pass   127.0.0.1:9000;
 fastcgi_index  index.php;
 fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
 include        fastcgi_params;
 }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
 location ~ /\.ht {
 deny  all;
}
}


Which part I must  add /home/user/web??
Sorry I'm newcomer in nginx and my english is very bad.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,229128,229185#msg-229185