Help with adjusting a script to remember last used folder

Hello,

I have a script made for InDesign called "MultiPageImporter2.5"

It enables importing a full PDF file into InDesign.

My problem with it is,

that everytime I run it, it doesnt remember the folder I used last.

I.e., If I was in folder1>Folder2>Folder3,

it will constantly open up to folder1, and not to folder3 which was the last chosen file was found.

I am familiar with scripting, so I would like to try to change this,

However, I opened the script and I couldnt find any place for such a setting.

The script runs the opendialog() function, which automaticall opens to that directory.

Does anyone know what can be done for this?

Thanks!

Davey