Validation file

Hi,

when using an "input" with special name ( in this case name="files[ ]" ), how can i define this name in the rules.

To explain this more:

I have a from :
<form ...>
<input name="files[]" type="file"..>
...
</form>

and I use he plugin VALIDATE. and I want to define message for this rule.?

maybe can someone help me ?
Ii use the plugin "jquery.validate" to validate my form