object.ShortPath 

function ShowShortPath(filespec)
{
   var fso, f, s;
   fso = new ActiveXObject("Scripting.FileSystemObject");
   f = fso.GetFile(filespec);
   s = "The short path for " + "" + f.Name;
   s += "" + "<br>";
   s += "is: " + "" + f.ShortPath + "";
   return(s);
}

Function ShowShortPath(filespec)
   Dim fso, f, s
   Set fso = CreateObject("Scripting.FileSystemObject")
   Set f = fso.GetFile(filespec)
   s = "The short path for "   & UCase(f.Name) & "<BR>"
   s = s & "is: " & f.ShortPath 
   ShowShortPath = s
End Function