Call a javascript from portal TLN without navigation

Hello all,
I have a script that capture active screen content.
I would like to embed this script link in the portal TLN and call it but without perform navigation.
The idea is to click the link on the TLN and to make the sctript run in background so it could capture the screen content.
Is someone has any idea how to perform this? or to achieve that purpose?
Thanks
Ami

Thanks GL for your reply!
Actually the script should run after content was loaded, the script use to capture the screen content.
However, what do you mean by drop the script in the framework and how do you it?
Thanks
Ami

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