Suppose you have a directory and you want index.html to load index.pl in that html page?

that if you dont have .html page in it?

like a special code something for .htaccess?

Thx

Do you have access to the httpd.conf file? If so add index.pl look for DirectoryIndex and add index.pl.

If not do a simple rewrite to load index.pl from index.html.

In other words, upload an .htaccess file with this:

DirectoryIndex index.pl
-if you want that file to load instead of index.html...

Though from your post you seem to want something to load after an index page loads (???), if so, inside you index.html page, include this meta tag:
<META HTTP-EQUIV="Refresh" CONTENT="0;URL=http://www.domain.com/index.pl">