JS Codes to check values in Check box Prompt(8.4)

[Ann]

Hi Guys,

I have checkbox prompt which has 3 values. Also i have added an 'All' in static choice.
Now my requirement goes like this..
If the user hits the finish button without selecting any values(after deselecting all), then the page should get refreshed and show All as selected.

So I need two codes..
1. To check if any value has been selected
2. make the first value(option) in the list as selected


Now I already tried the below codes and it throws an error..

function abc()
{var a=0;
   var fW = (typeof getFormWarpRequest == "function" ? getFormWarpRequest() : document.forms["formWarpRequest"]);
   var list = fW._oLstChoicesSprompt;
for (i = 0; i < list.length; i++) {
      if (list.options.selected) ...


Any clues ..? please help..