javascript: photoshop save as file type

gistfile1

function save_as_file_type(fileObj) {	// { fileName, fileType, path, quality }	
	if (app.documents.length == 0) {
          alert("Please have an 'photoshop' document before running this script.");
          return;
    }
	var quality = fileObj.quality || 3, //default 3
		path = fileObj.path || app.activeDocument.path,	
		document = fileObj.document || app.activeDocument,
		fileName =  document.name,
		fileType = 	fileObj.fileType,
		path = fileObj.path;	
	
	fileName = fileName.substr(0, fileName.lastIndexOf('.')); // remove file extension: x = x.replace(/\..+$/, '');
	var newFile = new File( path + "/" + fileName);	
	
	switch(fileType.toLowerCase()) {
		case "jpg":		  
		case "jpeg":
			var saveOptions = new JPEGSaveOptions();
			saveOptions.embedColorProfile = true;
			saveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
			saveOptions.matte = MatteType.NONE;
			saveOptions.quality = quality;
		  break;
		case "png":
			var saveOptions = new PNGSaveOptions();
			break;		
		default:
		  var saveOptions = new PhotoshopSaveOptions();
			break;
	};
		
	document.saveAs(newFile, saveOptions, true, Extension.LOWERCASE);
};