Dynamically Create Variable And Assign Value?

I have checkboxes which is generated within loop of records come from db and append the id with the name and id like this

<input type=checkbox name=CB.<?=$id?> name=CB.<?=$id?> >

Now in extension js file i want to check if check box is checked then create the variabel like CB1 (1 is the id) and the i want to assign value to this variable

i did something like this

[code ]
//arrayLength is the no of check boxes
for(var i= 0 ; i <arrayLength; i++)
{

[Code]....