Adobe Acrobat Reader选项卡保存和自动加载

I've created java script for Acrobat Reader which allows to save current opened tabs, it adds menu items: "Save Tabs", "Load tabs","Toggle auto load". It saves tabs and page numbers and restore them well. It's really helpful especially for Linux where not to much pdf readers. But I can't finish it in a way that I want. I didn't find a way how to catch open/close document event, or some timer event to automatically store current list of tabs. I've created java script for Acrobat Reader whi