Resize all layers ( Photoshop script )

/*

    This script resizes every layer within the active document.

    How to use: 
    - Photoshop script ( cs3+ )
    - Put in {photoshop_root}/presets/scripts/Resize Each Layer.jsx
        - Run from: File > Scripts > Resize Each Layer
        - ..or save the file where ever you want and run from there with: File > Scripts > Browse...
 
*/
 
/*
 
    <javascriptresource>
    <name>$$$/JavaScripts/resizeeachlayer/Menu=Resize Each Layer</name>
    <category>Resizing</category>
    <enableinfo>true</enableinfo>
    <eventid>64feff0a-8271-436f-8c59-d2105497d903</eventid>
    </javascriptresource>
 
*/
 
try {

  // Currently active document.
  var doc = app.activeDocument;

  // All layers
  var layers = doc.artLayers;
 
  // Run dialog...
  var size = dialog();

  // Loop through every layer...
  for( var i = 0 ; i < doc.artLayers.length; i++ ){

    var activeLayer = doc.artLayers.getByName( doc.artLayers[ i ].name  );

    // Save original ruler units
    var orUnits = app.preferences.rulerUnits;

    // Change rulerunits to percent
    app.preferences.rulerUnits = Units.PERCENT;
   
    // RESSIIIIIIIZE
    activeLayer.resize( size, size, AnchorPosition.MIDDLECENTER );

    // Roll back to original ruler units
    app.preferences.rulerUnits = orUnits;

  }
 
 
} // try end
 
catch( e ) {
  // remove comments below to see error for debugging
  // alert( e );
}
 
 
function dialog() {

  // Dialog box...
  var myWindow = new Window ("dialog", "Resize Each Layer");

  // Keeps things inline
  myWindow.orientation = "row";

  // Informational text
  myWindow.add ("statictext", undefined, "New size ( percentage ):");

  // This is the box where the size is inserted
  var myText = myWindow.add ("edittext", undefined, "");
  myText.characters = 5;
  myText.active = true;
 
  // Ok....
  myWindow.add ("button", undefined, "OK");
  if (myWindow.show () == 1) return myText.text;

}