Trusted Function "Save As"

I've created the following .js file in the "C:\Program Files\Adobe\Acrobat 8.0\Acrobat\Javascripts" folder on my pc.

File name "MySaveAsPO.js"

//script text as follows

/* saveAsPO Script */

mySaveAsPO = app.trustPropagatorFunction( function ( myDoc, path )
{
app.beginPriv();
var myDoc = event.target;
return retn = myDoc.saveAs(path);
app.endPriv();
});
myTrustedSpecialTaskFunc100 = app.trustedFunction( function ( myDoc, path )
{
app.beginPriv();

    var a = event.target.xfa.resolveNode("form1[0].header[0].NextPONumber[0]"); //copied ("form1[0].header[0].NextPONumber[0]") from an example
    var av = Date1.rawValue; //this is the name of the one of the fields I'd like to add to the save as file name although I'd like to use two fields.
    var g = "/s/AfterHoursLog/" + av + log".pdf" //the path I'm trying to save to is a shared drive "S:\AfterHoursLog"

    var retn = mySaveAsPO(myDoc, g);

   
app.endPriv();
return retn;
});

******************************

The script I have on the "save" button is as follows:

//calls trusted function in MySaveAsPO.js folder-level script

Any help is greatly appreciated.

Thanks.