Help With The Select All Rows CheckBox CAF Component

I’m using “The Select All Rows CheckBox” component from CAF in webMethods 7.1.3.
Regarding this component, how, can I get in client side (javascript) the rows that are selected, when this component is checked?
How can I change the “Checked All” to “Checked None” in “The Select All Rows CheckBox”, using java or javascript? I tried using the “checked” value in javascript but without any success.