Loop Through Subforms

I need to loop through sub forms and see if a check box is checked.  If the box is not checked I want the sub form presence to be hidden when the user clicks a button.  I can loop through the forms but I'm stuck from there.  Thanks for any assistance you can provide.

var oNodes = CRT130.nodes;

var nodesLength = oNodes.length;

for (var i = 0; i < nodesLength; i++) {

   if (CheckBox1.rawValue == "0") {

            oNodes.item(nNodeCount).presence = "hidden";

        }

    }