var imageFolder = Folder.selectDialog("Select the folder with TIFs to process");
if (imageFolder != null) processFolder(imageFolder);

function processFolder(folder) {
    var fileList = folder.getFiles()
     for (var i = 0; i < fileList.length; i++) { 
		var file = fileList[i]; 
		if (file instanceof File && file.name.match(/\.tif$/i)) { 
			open(file); 
			var doc = app.activeDocument; 
			var strtRulerUnits = app.preferences.rulerUnits; 
			var strtTypeUnits = app.preferences.typeUnits; 
			app.preferences.rulerUnits = Units.PIXELS; 
			app.preferences.typeUnits = TypeUnits.PIXELS; 
			var saveFile = new File(decodeURI(activeDocument.fullName.fsName).slice(0,-4) + "_web.jpg");
			saveFile.remove(); 
			SaveForWeb(saveFile,60); 
			app.activeDocument.close(SaveOptions.DONOTSAVECHANGES); 
			app.preferences.rulerUnits = strtRulerUnits; 
			app.preferences.typeUnits = strtTypeUnits;

		} else
		if (file instanceof Folder) {
			processFolder(file);
		}
	}
}

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