How to place an asset from the library to all pages via JavaScript?

Hello, I'm newbie in scripting that's why I need a help from one who knows. I need a javascript to place an asset from the library to all pages of my document.

I've tried to do it but all i have :

var myLibPath = (File("C:/Library.indl"));

var myLib = app.open(myLibPath);

var libItem = app.libraries[0].assets[0].placeAsset(app.documents[0]);

this places asset to the selected page only, may be someone can tell me how can it works for all pages.

Thanks!