How to inlucde external javascipt libraries

[eluser]ricmen[/eluser]
well if works tell me please to know

my .htaccess file is this

<IfModule mod_rewrite.c>
# Turn on URL rewriting
RewriteEngine On

# If your website begins from a folder e.g localhost/my_project then
# you have to change it to: RewriteBase /my_project/
# If your site begins from the root e.g. example.local/ then
# let it as it is
RewriteBase /MYAPP/

# Protect application and system files from being viewed when the index.php is missing
RewriteCond $1 ^(application|system|private|logs)

# Rewrite to index.php/access_denied/URL
RewriteRule ^(.*)$ index.php/access_denied/$1 [PT,L]

# Allow these directories and files to be displayed directly:
RewriteCond $1 ^(index\.php|txt|js|robots\.txt|images|css|opensearch\.xml|favicon\.ico|assets|forums)

# No rewriting
RewriteRule ^(.*)$ - [PT,L]

# Rewrite to index.php/URL
RewriteRule ^(.*)$ index.php/$1 [PT,L]
</IfModule>