Variable = Variable+num <--How do I do this?

I'm trying to increment a variable name so that it checks a hitTest against all items on the same level with the name "Card+"num. When I try to use this type of grammar in a hitTest statement, though, I get an error message.

I get the message: "Expected a field name after the '.' operator" when I type

Code:

---

for (var cn = 0; cn<31; cn++)
  if(cn <= 10)
      if(this.hitTest(_parent."Card0"+cn) {
        trace("Hit!")

---

I'm sure that this is easier than I'm making it for myself. Any help is appreciated...

code:

---

for (var cn = 0; cn<31; cn++)

{

	if (cn<=10)

	{

		if (this.hitTest(_parent["Card0"+cn]))

		{

			trace("Hit!");

		}

	}

}

---

Brilliant! It works!

Thanks.