app.popUpMenu in Mac and Safari

I have a PDF form in which I want to display a dropdown using app.popUpMenu() method.

I works fine in Windows 7 IE and Safari browsers.

But it is not showing the dropdown in Mac OS X version 10.7.4 with Safari 5.1.6

I am using the following script -

var aFruits = ["Fruits","Apples","Oranges"];

                    var aVeggies = ["Vegetables","Beans","Corn"];

                    var cRtn = app.popUpMenu(aFruits, aVeggies);

Is there is limitation for app.popUpMenu() method in Mac OS?