Script to rotate image inside frame Data merge

This script should do it.

function main() {

    // settings:
    var myAngle = prompt('Rotate all graphics by amount:', 90),
        absoluteRotation = true;

    if (myAngle == null)
        return;

    var doc = app.activeDocument,
        tm = app.transformationMatrices.add({ counterclockwiseRotationAngle: Number(myAngle) }),
        graphics = doc.allGraphics;

    for (var i = 0; i < graphics.length; i++)
        graphics[i].transform(CoordinateSpaces.PARENT_COORDINATES, AnchorPoint.CENTER_ANCHOR, tm, absoluteRotation ? MatrixContent.ROTATION_VALUE : undefined);

}

app.doScript(main, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Rotate all graphics');

Note: this will set the rotate of every graphic *to* a particular angle, and running the script twice won't do anything. But if you change absolute rotation to false

absoluteRotation = false;

 then it will rotate *by* the amount each time you run the script.

- Mark