Adecuar mi funcion

[Briss]

Código HTML:

<script type="text/javascript">
window.onload = function(){
    var cambia = document.getElementsByName('aplica')[0];
    if(window.attachEvent)
        cambia.attachEvent("onclick",Cambia);
    else
        cambia.addEventListener("click",Cambia);
    Cambia();
};

function Cambia(){
    var c = this;
    for (var i = 0; ele = document.getElementsByName("p1[]")[i]; i++){
        ele.disabled = !c.checked;
        console.log(i + " = " + ele.disabled);
    }
}
</script>