"SaveAs" Button (Inside Form)

I have been trying to get my "SaveAs" button on my form to follow a specified path, while naming the file after a text field in the form. For example, when I click on the "SaveAs" button in my form, I want the save as dialog box to pop up with the correct path (X:\Project Engineering\request form)and file named after a text field in the form. I have tried app.execSaveAs, this just brings up the SaveAs box.I have tried various JavaScript Code from suggetions in the userforums to no avail. I am using Adobe LiveCycle Designer 8.0. I am not that great at coding so if you could be very specific (and possibly give an example) with the answer it would be appreciated. Thank You