Javascript syntax for using a varable within a section reference

Question

I have a form with the structure: Form1

• parentSection1
  • childSection1
  • childSection2
  • childSection3... etc

I have made an array of all the childSection names (currentParent[]) and need to use it in a variable that accesses the nodes of each childSection.

var childNode = Form1.parentSection1.childSection1.nodes;  // this works if I reference it directly

what I need to work but can't get the syntax correct is:

var childNode = Form1.parentSection1.currentParent[i].nodes; // where i loops within a larger function

Any help would be much appreciated! Thanks!