You are missing my very first question. I do not want to just centre the page, but I'm trying zoom in to the level equivalent to "Fit Visible" (Ctrl+3) in adobe reader and then horizontally centre the page. It means the left and right margins of the page are not visible and you can see just the content of the page.

Your initial code is working perfectly, but just for small monitors. What I am trying to do now is to find the best zoom size according to the screen width, but I have no clue on how I can do it in vbscript. I reckon first step is to find the size of the screen.

Any idea?