If condition upload field in subform

If condition upload field in subform

Hi,

I've problem with script that on validate Alert that it's necessary to Upload a document in field3 (of subform).

//if (((input.Field1  ==  "Option")  &&  (input.Field2  ==  "-Select-")) &&  (Subform.Field3 ==  ""))
//{
//    alert "Insert a upload document!"

//    cancel submit;
//}

The script don't run,

Any help.

Thanks.

Mic