Javascript rule

Hello,

i would like to create a javascript rule which will be checkin if file exists in location C:\Mobile. If not then should be display appropriate pop-up. Can someone help me?

I wrote it but it doesn't work.

function checkfile()

    {

        var myObject;

        myObject = new ActiveXObject("Scripting.FileSystemObject");

        if(myObject.FileExists("C:\\Mobile\\55.jpg")){

           return true;

        } else {

          return false;

        }

    }

best regards,

Mateusz Owcarz