Get the current absolute path name?

You are correct, just tried it on an old laptop with Photoshop CS using Mac OSX and it seems that it creates a temp file and reports that information.
So sorry can't help you with CS.

WhoAmI function not working in cs. It not provide the correct path.

If using CS3 or CS4
alert($.fileName);
or this should work on all versions.

function WhoAmI() {
var where;
try {var F = FO;
}catch( err ) {where = File(err.fileName);}
return where;
};

NB: Neither will work if you are using binary scripts!

Sorry, i need the javascript current path(not input file name path). Because i run my script from outside of the script folder.

> How to get the current absolute path and file name in javascript?

app.activeDocument.fullName;

It's in the docs.

-X