Use form designer array with javascript

Hi ! 

I have some troubles with Array in form designer :

I created an array in a format with form designer with 4 column. The array is named $myArray.

Now, in my wizards in the actions properties i am using javascript to execute code when finish button is performed. BUT how can I get values filled in the array with javascript ?

For example is the first line of my array is : [a,b,c,d]

I would like something like vars.$myArray.getvalue("field1") return "a" !

If someone can help me, he wil be my friends !

Thanx you