Redirect forum link from wordpress post to another page which has a template with iframe pointing to the actual forum -

okay so... have wordpress post in have link forum.

the forum integrated wordpress design in iframe. go article page forum page , open link article in forum page's iframe (in forum loaded).

the forum page /forum/ thats how wordpress displays forum hosted under /forum/

i don't want people going directly forum without design http:/ /website.com/forum/

i hope explains it.

lets have wordpress post sidebar , in sidebar have links recent forum threads example 1 url:

http :// website. com/forum/showthread.php?tid=4

i created wordpress template page called forum.php within have iframe goes http :// website. com/forum/

the wordpress page applied forum.php template http :// website. com/forum/ notice small f.

so when go http://website.com/forum/ loads forum.php has iframe id=frmid , src=http://website.com/forum/

how have links inject http :// website. com/forum/ (forum.php iframe id=frmid) , load seamlessly?