Save in two sizes

gistfile1.txt

#target photoshop 
main();
 
function main() { 
    if(!documents.length) return;
    
    var doc = app.activeDocument;
    
    try{ 
        var Path = activeDocument.path; 
    }
    catch(e){
        var Path = "~/desktop";
    }
    
    var Name = decodeURI(app.activeDocument.name).replace(/\.[^\.]+$/, ''); 
    var layerName = app.activeDocument.activeLayer.name.replace(/[:\/\\*\?\"\<\>\|]/g, "_"); 
    var sizes = [1500, 400];
    var startState = doc.activeHistoryState;
    var initialPrefs = app.preferences.rulerUnits; 
    app.preferences.rulerUnits = Units.PIXELS;
    var saveFile = null;
    for (var i=0; i<sizes.length; i++) {
      saveFile = new File(Path + "/" + Name + "-" + layerName + "-" + sizes[i].toString() + ".jpg"); 
      doc.resizeImage(sizes[i], sizes[i], null, ResampleMethod.BICUBICSHARPER);
      SaveForWeb(saveFile,80); 
    }
    doc.activeHistoryState = startState;
} 

function SaveForWeb(saveFile,jpegQuality) { 
    var sfwOptions = new ExportOptionsSaveForWeb(); 
    sfwOptions.format = SaveDocumentType.JPEG; 
    sfwOptions.includeProfile = false; 
    sfwOptions.interlaced = 0; 
    sfwOptions.optimized = true; 
    sfwOptions.quality = jpegQuality; 
    activeDocument.exportDocument(saveFile, ExportType.SAVEFORWEB, sfwOptions); 
}