Wrong tree. Barking.
Insert From URL will go to a URL and give you back what it finds there, which might be the answer to a posted query or just a static page
While I can see it needs some amending what you are trying to do will be better served by setting a web viewer to some HTML which contains hat you have there.
Ah, OK, I think I got it now, cheers for the quick response.
depends on where you want to get the sig value.. but you can trigger a script passing it the sig, and then set a field with it
without seeing what your end code was it's only possible to point in a vague direction
Thanks once again for your response, I think I've nailed it now by passing the variable(s) as parameters using the fmp url. Once again, the Filemaker Forums open up a trove of possibilities!