vRO scriptable task to return top level folder of a VM

Every so often you have nested folders in a vCenter and want to return only the top level folder.  Here is a function to return the top level folder only:

function return_folder_path(vm)
{  
                var parent = vm.parent;  
                var parentNames = new Array();  
                var vmPathName = "";  
                while (parent instanceof VcFolder){  
                                parentNames.push(parent.name);  
                                parent = parent.parent;  
                }  
                for (i=(parentNames.length-2); i>=0; i--){  
                                //vmPathName += "/"+parentNames.pop();  
                                vmPathName += "/"+parentNames[i]; 
                }  
                return vmPathName;
}