How to specify the saving path pdf by a "saveas" button in Javascript?

Hello,

Firstly, I useLiveCycleES3designeronPC.I createda form witha buttonexecuting aJavascriptthat opens adialog box "save as ..." like this:

\ \Scriptsave-as\ \

app.execMenuItem("SaveAs");

I would like topredefineafile pathtoopen thedialog boxthatopens by defaulton the currentlocation of the file"C: \ export\" for example.

Could someonehelp metelling methe code andnomenclature to be usedfor this?

I knowLivecycleuseXFAlanguage and canuse the "myDoc.saveAs ();"but Ido not know how:-/

I found this post in this forum but I don't understand how to use this code directly with a click event on a button

http://forums.adobe.com/thread/685920

There is also a tutorial here but Ican not seemto apply

http://acrobatusers.com/tutorials/how-save-pdf-acrobat-javascript

Thank youin advance for yourhelp :-)