How to control resolution of exported jpeg

I know I can control the resolution of an exported jpeg through the UI with the Export JPEG dialog box. I'm wondering how to access that setting with the object model. When I export to a jpeg with my script, it seems to use whatever resolution setting was last selected through the UI. I would like my script to explicitly say what resolution to use.
Thanks!

Hi Mathew,
Please check the below JS code. I am not use the UI just Prompt to get the input value of resolution.
var myPrompt = prompt ("Enter the Value Resolution Value", '300')
var myFold = Folder("~/Desktop");
var myFile = new File(myFold +"/"+"csmphil.jpg");
SaveAsJPEG(myFile);
function SaveAsJPEG(myFile){
    try{
        app.jpegExportPreferences.exportResolution = parseInt(myPrompt);
        app.jpegExportPreferences.jpegQuality = JPEGOptionsQuality.MAXIMUM;
        app.jpegExportPreferences.jpegRenderingStyle = JPEGOptionsFormat.BASELINE_ENCODING;
        app.selection[0].exportFile(ExportFormat.JPG, myFile);
        }catch(e){};
thx,
csm_phil

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