Converting simple AppleScript to JavaScript

Hello to all,

I need to convert a simple AppleScript to JavaScript, but as I don't know one bit about JavaScript, is there anyone willing to help me out ?

Here is the AppleScript:

tell application "Adobe Photoshop CS5"      activate           set display dialogs to never           set thisdoc to current document           tell thisdoc                     resize image resolution 300 resample method none           end tell end tell

Very simple script to resize some low-res pictures without touching final resolution.

Thanks !